What is Rating: Definition and 143 Discussions

Passer rating (also known as quarterback rating, QB rating, or passing efficiency in college football) is a measure of the performance of passers, primarily quarterbacks, in gridiron football. There are two formulas currently in use: one used by both the National Football League (NFL) and Canadian Football League (CFL), and the other used in NCAA football. Passer rating is calculated using a player's passing attempts, completions, yards, touchdowns, and interceptions. Passer rating in the NFL is on a scale from 0 to 158.3. Passing efficiency in college football is on a scale from −731.6 to 1261.6.
Since 1973, passer rating has been the official formula used by the NFL to determine its passing leader.

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  1. Q

    Solar Voltaic System Power Rating

    Many suppliers of solar systems give power ratings in terms of kW. However, how should I size the system for loads whose PF is not unity? I am specifically concerned about the solar panels. Should the panels' kW rating be matched with the load's kVA rating? Thank you
  2. J

    Rating systems for chess players

    All chess rating systems including the Elo rating system are based on a procedure called "scoring" which assigns a score of 1 for a win, 0 for a loss, and 1/2 for a draw. This procedure reduces the trinomial nature of chess game outcomes to a binomial variable and thereby greatly simplifies the...
  3. arpansen

    Interpretation of the rating of a real transformer

    The rating of a real transformer is 15 kVA , 2300/230-V then can we say that the primary rms is 2300 V or can we say that the secondary rms is 230 V or both. To clarify further, suppose to solve for certain characteristics of this transformer like primary current and secondary current i use...
  4. T

    How is an electric motor's power rating defined?

    So, I'm not an expert on electric motors. I have yet to take a formal class on electric motors. But I am however in a position where I'm required to size a couple electric motors for a project. I've been using software that is supposed to help size motors depending on the application and I...
  5. J

    What is the proposed scale for rating mathematical acumen?

    How good or bad are we at math? Mathematical ability obviously varies from one person to another. I propose a scale in which a zero is the inability to add 2 + 2, 5 is the ability to successfully complete college-level math courses, and a 10 describes the ability to come up with mathematical...
  6. B

    Momentary switch amp rating question

    Hi all. Hope you can help me out. I'm making a battery powered electronic cigarette and I need a momentary switch that is rated above 20amps at 8,4v. There tons of switches out there but the ones I like are rated at 3A/250VAC or 2A/ 36V DC etc, do these switches have a higher amp rating if...
  7. O

    Understand BIL Rating & Maximum Voltage in Equipment

    The difference between BIL rating and Maximum voltage? Like is the BIL voltage the highest it can take in just one instant? how do i know what is the highest continuous voltage a piece of equipment can take? Like for a Cap bank i see a BIL rating but i need to know what's the maximum voltage...
  8. M

    What is the watt rating of a mystery MOT transformer?

    My apologies if this has already been covered. I did a search, but couldn't come up with anything. My question is this. If you come across a random transformer with no markings, how can you tell it's watt rating? I have acquired several MOT's, and wish to use them in a DC arc welder. I...
  9. T

    Why is the non-inverting amplifier's bandwidth rating lower than expected?

    Hello, I have a question that I thought some of you may know an answer to. I was recently testing an op amp is several closed-loop feedback configurations. Primarily inverting, and non-inverting. When testing the output voltage of an invertin amplifier, I found that the output signal...
  10. D

    Disparity between resistor power rating and rated voltage?

    Hello there, I am wondering why the resistor maximum voltage is not simply the square root of the product of its wattage and its resistance. According to the attached datasheet (pdf) for example, the maximum voltage of a 2.2 mega ohm, 0.25W resistor, is 250V (instead of 742V as calculated)...
  11. J

    Basic question about the power rating of a kettle

    Homework Statement Hello all. I am very new to learning about science and I've been given a question in my homework about power ratings and heat transfers. Basically the question is, on an electric kettle why is the power rating given as (e.g) 1500W - 2000W instead of just a single figure...
  12. S

    Determining Flange Rating for a 316 SS Pipe

    Homework Statement What is the appropriate flange rating for a 316 stainless steel pipe carrying saturated steam at a temperature of 180°C Homework Equations I'm not quite sure to be honest. The Attempt at a Solution Could somebody give me the general approach to determining the...
  13. K

    Calculating Heat Absorbed & Estimating Power Rating of Electric Heater

    the question states exactly: Air passes over an electric heater at a steady rate of 2500 cubic centimeters per second. the steady inlet flow temperature of the air is 20 degree celcius and the steady outlet temperature is 40 degree celcius. part a. what is the heat absorbed by the air...
  14. Q

    Power Strip Rating: Gauge vs Quality

    Hi Does anyone know how to rate a power strip? I read somewhere that the rating is based on the gauge of the cord. However, this does not seem to be very accurate because if the cord is very good but sockets are of poor quality, the socket board could overheat. Also, if the cord consists...
  15. T

    Metric for rating funtion accuracy from R^m to R.

    I'm writing program in which I generate pseudo random expressions with the hope of finding one that closely approximates the given data set. The functions map from R^m (an m-tuple of reals) to a real. What I need is a way to rate the functions by their accuracy. Are there any known methods for...
  16. Z

    What is the Activation Sensitivity of the A1302KUA-T HE Sensor in Gauss?

    I know NOTHING about electronics like this. However, I am taking on a small project. I have a question that you can probably answer in half a second. I bought a few HE sensors, which are on their way. I need to know what activation sensitivity this HE sensor has in Gauss...
  17. arkaddas

    How to determine the rating of a capacitor for a specific purpose?

    I need to determine the capacitance for a capacitor that I will be connecting in series with a DC series motor to control the current drawn from the battery by the motor. How should I proceed? I have attached the schematic.
  18. M

    Simple question regarding the Ah rating of a battery

    Hi all! Excuse the simple nature of this question, but I'm a mechanical engineer working on building his own PAS bicycle and need to understand this to go ahead with my work. I understand that a 12V 7.2 Ah battery ideally discharges 7.2 ampere of current at a nominal voltage of 12V for 1...
  19. M

    Determining the switch rating for a lamp

    I'm in the process of repairing a lamp that I found with a broken switch. I know the lamp mechanism is functioning because I've bypassed the switch and plugged it in and it works fine. I needed to buy a new switch and they all have a current rating. I'm using 1 60 W bulb with a standard North...
  20. B

    Magnetic Generator Power Rating

    Hi, I am very new to this, so if my questions sound a bit stupid please point me in the right direction. I want to build my own 2.5 kW magnetic generator, but would like to understand a bit more how this works. Please see attached picture. I will be using the 24 magnet / 18 coil...
  21. S

    Inductive generators, what is their output compared to their horsepower rating

    Let say I have a 3 phase ac motor rated at 40 hp. Now I'd like to be able to convert this to act as a single phase induction generator (I hear is possible but I don't know much about it). driven by an ICE at around 1800 rpm. What would its power output be in kilowatts. Or more importantly...
  22. T

    Is Cable Length a Factor in Determining Coaxial Cable's Power Rating?

    I am trying to calculate the maximum power of a coaxial cable, based on heat transfer parameters and limiting temperatures of cable components. I've determined that a certain heat load on the conductor surface (in Watts per inch of cable) will put the dielectric above its operating temperature...
  23. S

    BTU rating of Earth below frost line

    Does anyone know how many BTU's the Earth is capable of transferring per minute or hour per square foot of surface area below the frost line? thanks -Steve
  24. G

    What are the chances of a 5 sigma confidence rating being wrong?

    I'm trying to figure out what the odds of 5 sigma confidence rating has of being wrong. According to one website it is 0.000028% which is 1 in 35,000 but I've seen so many divergent answers as to what the odds of 5 sigma being wrong are that I want to be sure. I've seen people say it is as high...
  25. D

    Can I Use a 100W Bulb for My Table Lamp?

    Hi, I have a table lamp, ratings: 110 - 240V 50 - 60 Hz Max 60W The plug is fitted with 13A fuse. Now, the thing is, how did they calculate the max 60W out from these ratings? According to P = V * I, my max power should be a very large value. So can I fix a 100W bulb to this...
  26. B

    Magnetic generator power rating

    Hi there, I have recently downloaded this document on magnetic generators. I would just like to confirm a most probably very standard thing. One of the generators discussed is a 2.5 kW at approx 250 rpm. To confirm, is the 2.5 kW delivered per minute or per second at the rated speed?
  27. S

    What is the Load rating of Aluminum rectangle tubing?

    Greetings, I will describe the problem and my proposed solution which leads me to the load bearing question.. Problem: Pickup camper cabover floor is compromised where it attaches to the driver side sidewall, i.e., separation of floor from sidewall due to some dryrot and a blowout doing...
  28. N

    Calculating Wattage Rating in Series/Parallel Circuits

    Homework Statement When calculating wattage rating, if you have resistors in both a series and in parallel circuits can you still use P = V2/R to solve for the wattage rating over each resistor if you're given the voltage of the battery or do you have to calculate the voltage drop after each...
  29. O

    Power rating of a heater in the same outlet as a hair dryer

    Homework Statement A heater is plugged into the same 120-V AC outlet as an 800-W hair dryer. If the total rms current drawn is 16.7A, then calculate the power rating of the heater. Homework Equations Pav=\frac{1}{2}I2peakR The Attempt at a Solution Irms=Ipeak/\sqrt{2} So...
  30. T

    Min torque rating for a gear and pinion

    I have a pinion exposed to 100 oz-in torque and a gear exposed to 300 oz-in of torque (gear ratio of 3). Does the pinion need to have a torque rating above 100 or 300 oz-in?
  31. A

    Importance of Current Rating in Laptop Chargers

    so i went to buy a laptop chrger with rating 19.2v and 3.2A but he gave me a charger with rating 19.2v and 4.2A and said the current rating is not important why is that?
  32. J

    Calculating the MIPS Rating for a Multi-Processor System

    I need some help with this problem I am trying to solve if anyone can help. Each instruction on a certain computer system requires 1 cycle for any type of instruction. This system includes N processors and is used to execute a program contain 16 million instructions and 60% of the code...
  33. S

    Hydrogen + oxygen combustion rating

    hello i going to make an moto bike of 50cc engine to work witn hydrogen... and my problem is : how many liters of hydrogen i vgot to pun in 1 litre of oxygen.. what carbirator i vgo to make.. or were i can take one li it for example the combution rating of fuel/oxygen is 14.7/1 i've...
  34. P

    How to know the VA rating of a transformer

    Hello to all I am an electrical engineer and in an interview I was asked to tell the MVA rating of a transformer of few KV , and nothing was given means neither the power factor and nor the current , so I want to ask you people is there any way to determine the MVA rating of the...
  35. Y

    I have two transformers of rating 500 KVA. Power supply avaiable is 11

    I have two transformers of rating 500 KVA. Power supply avaiable is 11 KV. what size of HT cable should I use?
  36. SixNein

    News The Impact of a Potential Downgrade on the United States Credit Rating

    Many economists are predicting that America will get downgraded from AAA by at least one agency regardless if congress raises the debt limit. There has already been a great deal of damage caused from the political posturing in Washington. If the central government's debt gets marked down, I...
  37. F

    Car things (Why does lead increase the octane rating)?

    Hey guys and girls The first thing I should probably ask is why do fuels (Hydrocarbons) spontaneously ignite when they are compressed, this seems rather strange to my brain in fact it makes my brain feel like it's having a meltdown (if you have ever had that feeling). The whole idea confuses...
  38. U

    How Many Turns Requred For 220v-100v,180v 100VA Rating Transformer

    Can anyone tell me how many turns required for designing a 220v-100v,180v and 100VA amplifier? Rating : 100VA , Frequency : 50Hz Primary Secondary 220 100 220 180 Question-01: No. Of Turns in primary and secondary...
  39. S

    3-pin (Gas Discharge Tube) Surge arrester rating DC spark over voltage

    3-pin (Gas Discharge Tube) Surge arrester rating "DC spark over voltage" Could someone please help with a question about Gas Discharge tube, surge arresters rating? I am looking at a public address audio equipment which uses a 100vrms audio lines driven from a audio transformer. Currently...
  40. M

    Calculating load rating of a pulley stand

    Hi Guys, I'm a mechanical engineer looking for help with a structural problem, I work on-site at an iron ore mine in Western Australia. Typically once we design stands we get them fabricated then sent for certification. Certification involves a company putting the load which we wish to get...
  41. L

    Finding the Voltage Rating of a Battery in Fig. 3

    Homework Statement The field generated in Fig. 3 is due to a battery connected between the center conductor and the sheath. What is the voltage rating of the battery? (i.e. what is the electric potential of the positive terminal with respect to the negative terminal of the battery?) I...
  42. D

    Grade 9 Power Problems (Watts/kWh, power rating question)

    Homework Statement So, i need to learn how to do questions with finding out the power rating, and energy etc etc from using the triangles given and i am having some trouble since some of my triangles are missing and i need some help with converting. Homework Equations 1) A hot plate...
  43. W

    What is the relationship between the DC and AC ratings of capacitors?

    Hello everyone, I have a few microwave caps rated at 2100 Volts AC and was wondering about their DC rating. I've heard that the DC rating of AC caps is usually 3-5 times the AC rating which seems to make sense but I'm not absolutely sure... If someone could please confirm or deny this I'd be...
  44. T

    What is the rating of the bulb?

    Homework Statement Given a 24VDC Generator, a 12VDC Battery(Discharged), a bulb(no rating yet), pieces of thick wires(unlimited length you can use) You need the 24VDC generator to charge the 12VDC battery, but direct will damage the battery. What should I do with the bulb? I need to build a...
  45. T

    Capacitor/Transformer Voltage Rating for a 12V Power Supply?

    Hello, About me...so you know where I am coming from. If you don't want to read, skip to the end-ish... I'd like to start off my saying that I know next to nothing about electronics although I am eagerly reading the All New Electronics Self-Teaching Guide right now and it is confusing but...
  46. G

    Calculating Wattage Rating for Generator to Power Electric Motor

    What would be the wattage ratting for a gas/diesel generator to power an electric motor with these specs. 72-144VDC 190A Continuous 43.7HP Continuous Thanks
  47. T

    Calculate KVA Rating for 12kW Load at 0.8 Lag

    Hi there, Can some one assist me as to how to answer this question... An alternator is connected to a 12kw load and operating at a power factor of 0.8 lag. what is the kva rating of the alternator required to drive the load? i don't know what formula to use so Any help would be great...
  48. Q

    Resistor Power Rating: What Does It Mean?

    i have a question about resistors. i thought they were described by their resistance - 20 ohm, 40 ohm, 2 Megaohm, etc. how come I see "power" values on resistors? for example my lightbulb says 40 watts. but i thought the power is simply P = V^2/R and that would depend the voltage of my power...
  49. G

    Calculating the load rating for a multi-bar hinge?

    I need some help in calculating the load rating for a multi-bar hinge. This hinge is different from a door hinge. It is fitted beneath the windows and can be used for either side-opening of the windows or for top-hung windows (windows for high-rise glazed glass buildings). The hinges are...
  50. J

    Uncovering Common Interests in Social Networks: A Rating System Approach

    I think an interesting problem would be trying to deduce how likely you are likely to enjoy a piece of internet content by how well your friends like it. We all have different backgrounds and interest and some things have more mass appeal then others. If you take two friends, you can have widely...
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