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. C

    Copper contacts 1200amp rating

    I am in the process of designing a grounding assembly for a high voltage switch and need to determine what contacts will handle 1200amps. The contacts are U-shaped and a flat copper conductor bar rotates into the U-shaped contact to make the connection. Can anyone point me to a reference or give...
  2. T

    Transformers: Calculating Base Rating and Per-Unit Values - 100 kVA, 1 kV

    Hello all, I am new to the forum and hope my question is appropriate for this section. My question is about per-unit notation and calculations. Basically I've been given the resistance, reactance at the primary and secondary windings of a transformer, core losses and inductance, etc. The...
  3. M

    How Can I Boost the Voltage Without Increasing the Current Rating?

    I want to convert ac 50V, 1.8A into 100V, 1.8A. The voltage is doubling, while the current rating is required to be the same. How can I achieve this? A transformer action step ups the voltage, but does it lowers the current rating? Thanks
  4. S

    Why doesn't a resistor burn up when its power rating is exceeded?

    Homework Statement The heating resistor is rated at 10ohms and 1W. By how much was its power exceeded? Why didn't the resistor burn up? This is a question taken from an Electrical Equivalent of Heat lab assignment... here is a link to the exact same lab we did...
  5. L

    Determine the Minimum Wattage Rating for Resistors

    Minimum wattage rating ?? Homework Statement Hi everyone ,, got the following question a. Find the total resistance, current and unknown voltage drops b. Verify KVL around closed loop c. Find the power dissipated by each resistor and note whether the power delivered is equal to the...
  6. L

    Elo Rating System: Explaining Statistic Details

    who can explain me the statistical details under the elo rating system? in particular why the expeted value rapresent the score of the game. thanx
  7. L

    Football Rating Model: Probability of Win, Loose or Draw

    i am wondering about how it is possible compute the probability of win, loose or draw in football game or any other sport. who knows the model the bookmaker use? and which level of confidence they have?
  8. gmax137

    Maximum licensable core power rating

    Back in the 1970's and 1980's I was told that the NRC wouldn't license a design over 3800 or 4000 MWth. The new designs must be considerably higher (another post mentions the Hitachi at 1700 MWe, seems like that must be approaching 5000 MWth core power). Was I given bad info way back when, or...
  9. M

    Does amp rating of PSU effect output ?

    i have used different PSU on a simple electromagnetic motor (tattoo machine) and have notice a machine will run a certain way at 2 volts on one power supply but require 9 volts from another power supply to run the same. Question being is it the amp rating of the power supply that does this...
  10. B

    Understanding the Ultimate Strength of Steel

    I have neither physics nor engineering backgrounds. I am trying to figure somethings out, and I need some basics cleared up. I will pose my questions as such: 1.) How would you go about rating the strength of steel? 2.) How would you go about testing the strength of steel? For example: is it...
  11. V

    Power supply - Importance of amp Rating?

    Power supply -- Importance of amp Rating?? Hello all: I have a TV tuner that requires a DC 7.5 volt, 500 ma power supply. I have a 110 V input power supply rated at 7.5 V DC 1,000 ma. Can I safely use this powersupply with the tuner. Analogy: I can plug a 3.5 am vacuum cleaner into a 15...
  12. M

    Finding grounding strap rating

    hi gents, need ur assitant in finding the current carrying capacity of grounding strap (braided cable) if the cable size is one inch or 25 mm, how can I know how much current can it handle? your help is highly appreciated. Regards,
  13. O

    How to estimate the Rating of Transformer

    T/F=Transformer usually T/F is used according to the load of the area, street etc. How they estimate that 50 KVA transformer is enough for this load,street? any formula or method please explain ::Thanks
  14. K

    Calculate TKPH Ratings for Mining Trucks Using VIMS Data: A Beginner's Guide

    I've just started a research on the tyre of mining trucks and am a bit unsure on how to calculate the TKPH ratings. Say for this set of data from VIMS, GMW = 390 tons Payload = 245.1 tons Total cycle time = 15:29 minutes Total cycle distance = 6.8 km And that is one shift. So, mean tyre...
  15. D

    Polishing a BK7 Prism to 4020 Scratch Rating

    I have a bk7 prism (borosilicate...) and I'd like to polish it to a 4020 scratch surface rating. How would I go about doing this?
  16. N

    Refrigerator power rating and heat absorption

    Homework Statement A refrigerator is rated at 370 W. What is the maximum amount of heat it can absorb from the food compartment in 1 minute if the food compartment temperature is 0 deg C and it releases heat into a room at 20 degrees C. Homework Equations COP=Qc/W W=Qh-Qc The...
  17. S

    News Criminality of bond rating agencies

    Can someone please tell me why the heads of the big Wall Street bond rating agencies haven't been charged yet? I don't even know if they're being investigated. We hear a lot about AIG and the banks, but not a lot about outfits like Moody's. I've called news organizations and I don't get good...
  18. P

    Center Tapped Full-Wave Rectifier minimum Io rating?

    http://img26.imageshack.us/img26/3844/fullwave.jpg Just as the title states I am having trouble calculating the minimum Io rating in a Center Tapped Full-Wave Rectifier. I thought it was I AVE x 1.2 but that has not seemed to give me the right answer. I would appreciate any help. (The scan...
  19. K

    Is there a rating system for semiconductor manufacturers and distributors?

    I'm looking for a way to get accurate opinions, experiences and recommendations from others in industry on the quality of different electronic suppliers. Specifically, I want to know the quality of the suppliers of MCUs. What are your experiences with Freescale, Renasas, Microchip, Infineon...
  20. B

    Can a Transformer Rated at 225 VA Only Supply 25 mA on the Secondary Side?

    When a transformer is rated 225 VA, Vprimary=120 V and Vsecondary=9KV, Isecondary=25 mA, does this mean that on the secondary side the transformer can only supply 25 mA, no more, no less than rated current. Thanks
  21. Z

    What is the recommended size for a neutral conductor in a 3 phase 4 wire system?

    Hi, Frankly, I'm new to this forum. So please do guide me if I posted wrongly. I need some help in sizing the neutral wire. For a 3 phase 4 wire system (3Ph + N), what is the recommended size of the neutral conductor. Should it be the same as the phase conductor or should it be 50% of the...
  22. B

    What Output Rating (Watts) Do I Need for a Pump to Lift 8kg of Water per Minute?

    Homework Statement A pump is to lift 8.00 kg of water per minute through a height of 3.50 m. What output rating (watts) should the pump motor have? Homework Equations The Attempt at a Solution I have no idea how to even start.
  23. T

    What is CV rating and its significance in capacitor specifications?

    Can anyone tell me what this means in a capacitor spec, other than that I know its associated with leakage current? Is CV for capacitance*voltage, or coulombs*voltage? If its cap*voltage, I will get units in coulombs (coulombs/volt * volt), so what do they imply then to get your leakage...
  24. T

    Superconducting material has a rating for critical field intensity

    Hi, here is a couple of questions about superconductors Each superconducting material has a rating for critical field intensity. Now, does the field generated by its own current count? And also what is the current superconducting (type II) material with highest current densities achieved...
  25. R

    How Fast Can an MRI's Magnetic Field Safely Shut Off to Prevent Harm?

    Homework Statement Magnetic resonance imaging (MRI) is a medical technique for producing "pictures" of the interior of the body. The patient is placed within a strong magnetic field. One safety concern is what would happen to the positively and negatively charged particles in the body fluids...
  26. T

    Tolerance rating on a 0 Ohm resistor?

    Tolerance rating on a 0 Ohm resistor? I'm just curious why the zero ohm "jumper" resistors I use have a tolerance rating of 5%. This doesn't really make sense to me because 5% of 0 Ohms is still 0 Ohms. I understand that even a close to ideal conductor is not going to be 0 Ohms, but why do...
  27. N

    Creating a Horse Racing Rating System

    Homework Statement Hello my name is Luke , This may seem random but i need your help as I am a hardcore Horse Racing fan and need to come up with a rating tool to rate horse's so i can sort the average horses from the good ones and I have been coming up with all sorts of calculations...
  28. Ivan Seeking

    Smokey movies may get R rating

    http://www.ny1.com/ny1/content/index.jsp?stid=1&aid=69586 If smoking scenes will demand an R rating as does violence and sex, then I assume that the person would have to be smoking an entire pack at once, blowing smoke from every orifice in their body, chomping on a bale of chew, and wearing...
  29. J

    Choosing the Right Voltage Rating for Your Capacitor: What is the Rule of Thumb?

    Hi, What is the rule of thumb for choosing the voltage rating of a capacitor? Should it be twice the operating voltage or is this overkill? Thanks
  30. S

    How do I find Capacitor rating to start / run Single phase motor

    I am trying to refurbish a 1.1KW single phase motor (1445 RPM) but both start and run capacitors are missing. How can I calculate what capacitors are required. Motor is Rated 7.2 A (220 VAC) Look forward to your help. Thanks.
  31. Evo

    News Bush approval rating rebounds in new poll

    This is amazing, why has his approval rating suddenly jumped up? WASHINGTON (Reuters) - President George W. Bush's approval rating has rebounded to 44 percent, the highest level in a year, in the latest USA TODAY/Gallup Poll, the newspaper reported on Tuesday. Bush's approval rating...
  32. C

    Min voltage rating of capacitor

    i was solving a prob the foll prob on electrical resonance. a resistance is connected in series with an inductor which inturn is connected to 2 capacitors(capacitors are in parallel w.r.t each other, and one of them is trimming capacitor).the circuit is now connected to a relay whose...
  33. M

    Current/Voltage rating on power cord

    I have 2 identical scanners that have 2 different power cords. One of them is 3A/125V and the other is 7A/125V. My question is, does the difference in amps matter that much. Could someone explain this to me in detail?
  34. H

    Output rating of the pump motor in watts

    -------------------------------------------------------------------------------- A pump is to lift 29.0 kg of water per minute through a height of 3.70 m. What output rating (watts) should the pump motor have? An airplane pilot fell 380 m after jumping without his parachute opening. He...
  35. D

    What is the maximum power rating of a kettle

    Hey, i got a circuit question, and I'm not sure if i did it right, and was wondering if anyone could show me how to do it A 750W microwave oven is plugged into an outlet and turned on. All three lights are on. What is the maximum power rating of a kettle that could be operated in the other...
  36. A

    Bearing failure rating? Simple rev counter?

    Firstly I would like to point out I have absolutely no idea what I am doing and will most likely be blind or dead by tomorrow. But anyway. I've finally finished me first turbo jet engine (from scratch I would like to add and designed myself and dodgy as I am pretty convinced that it won't...
  37. A

    Bearing failure rating? Simple rev counter?

    Firstly I would like to point out I have absolutely no idea what I am doing and will most likely be blind or dead by tomorrow. But anyway. I've finally finished me first turbo jet engine :approve: (from scratch I would like to add and designed myself and dodgy as :biggrin: I am pretty...
  38. P

    Fuse Rating Problem: Which is True?

    Some physics books said that the fuse rating is the maximum current that the fuse can carry without melting it. But some said that the fuse rating is indicating the current at which the fuse would immediately melt. Which is true?
  39. Mk

    Thread Rating Voting: Can Non-Mods Vote?

    One time I voted on a thread, I don't know how I did it, but I did. Is it that only super-mentors and moderators can vote on a thread? And it was a strange techical mistake that one time?
  40. Math Is Hard

    Rate My Professors: Reviews of U.S. and Canada Teachers

    I was checking out a site called www.ratemyprofessors.com to get the low-down on some prospective teachers and I found it very helpful. They have listings for schools in the U.S. and Canada. I looked up the reviews of former teachers and they are pretty accurate. I particularly enjoyed the...
  41. J

    What is the Amperage Rating of a 3-Pronged Edison Plug

    I know this isn't quite what you mean when you say electrical engineering, but, how many amps is a standard three-pronged edison plug rated at? Also, what is common house wiring rated at? I believe that a three-pronged plug is rated at 15 amps and that logically the wiring should be able to...
  42. Zantra

    News Does the public's perception of Bush's 9/11 response overshadow other mistakes?

    http://www.cnn.com/2003/ALLPOLITICS/11/10/elec04.poll.bush/index.html And he's got nowhere to go but down:P
  43. N

    Have You Tried the New Rating Feature on PF Version?

    Hi everyone! when I first joined this PF version I really liked the idea of rating topics. But I noticed not many have been rated do you guys not see the feature or something? just wondering...
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