Battery Definition and 1000 Threads

Guess its pretty simple- Case1- I connect a bulb of less power to a battery of voltage, say 1.5volts. Case2- I connect a bulb of more power to another battery of same voltage, say 1.5volts. What is difference seen in the two cases? : • will the battery drainout quicker in case2...

there are some computer related gadgets out there which, courtesy of the OEM decisions, have to be used with a small battery. E.g. some of the graphics tablet related pens are that way. Perhaps in some situations (like "battery prices just went up by 1000%" situation) it might be nice to be able...

A graduate student is trying to develop a flow battery based on aqueous solutions of 1 M Cu2(SO4) and Fe(SO4) (recall that the sulfate is divalent, e.g. (SO4)-2 and assume complete solubility). Given a chart like this : CHART How would I know that I need to select Copper (I) and Iron (II)...

Homework Statement A 12V battery has an internal resistance of 6Ω. a) If this battery is connected to a 10Ω load, calculate the power dissipated by the load. b) Draw a graph showing how the terminal voltage of the battery and the current it can supply vary with load. c) Derive a value...

Homework Statement Connect a battery to a solenoid A cylindrical solenoid 40 cm long with a radius of 8 mm has 250 tightly-wound turns of wire uniformly distributed along its length (see the figure). Around the middle of the solenoid is a two-turn rectangular loop 3 cm by 2 cm made of...

A 3v battery is connected to a capacitor and 2 light bulbs all in parallel set up 1. Where is the total voltage drop at t = 0 2. Where is the total voltage drop at t = infinity 3. Which light bulb is brighter? From my understanding, since this is in parallel set up at t = 0 the voltage...

My son pulled the wires off of the charging plug for his motorcycle (mini-bike). I can use a Fluke to determine what side is positive comming from the charger, and trace the positive side from the battery to the charging socket. My question is when charging do I connect the positive side of...

Hello to all, this may seem a very simple question but i can't work it out and have no clue where to start. My question is: A 6v battery charges up a 470 microfarad capacitor in 1 second, what is the final charge of the capacitor? and what is the current while the capacitor is charging? i...

Dear Experts There are solar charging devices in the market for electronic devices. These contain some electronics which I suppose is to regulate the power or as controller. Lets say I have a 6 volts device and I have a solar panel rated at 6v. If without any electronic controller...

hi guys.. I'm new here and this is my first post.. my friends told me that the title of this post is impossible and i need a car battery to heat the 800W nichrome wire, and i believe them.. they also said that AC will solve the problem.. but i need to use DC so i came up with using diodes.. the...

If there is a parallel plate capacitor, connected to a battery, which is then disconnected, there is NO voltage now, but "Q" (charge) on the capacitor remains the same. YES OR NO? I think yes.

I would like to know about selecting the proper lipo batteries. For example, for the following motor spec a suitable battery has to be selected Motor Kv 540KV RPM/Volt (What does KV in 540KV represent?) Max Continuous Current 115 Amps Max Continuous Power 4800 Watts Max Lipo Cell...

Hi, I was doing some tests with lemon batteries today and found that it produced little current (not enough to light a small LED at least and I serially connected 4 lemons getting above 3V) which is explained in some places in the following way: 2 electrons are produced by the zinc (if your...

Homework Statement Find the magnitude of the current in the 14V cell. Answer in units of Amperes. Homework Equations Kirchoff's junction & loop laws: I1 = I2 + I3 ƩΔV = 0 V = IR Rseries = R1 + R2 + ... 1/Rparallel = 1/R1 + 1/R2 + ... The Attempt at a Solution At...

Homework Statement For the circuit shown in the figure below, calculate the current I4 through the 1.94Ω resistor. As shown, R1 = 4.05Ω, R2 = 8.11Ω, R3 = 6.17Ω, R4 = 1.94Ω, I1 = 2.97A and E1 = 12V Homework Equations V=IR ƩI in a junction = ƩI out of a junction ƩV in a loop = 0 The...

I have a phone. Since it was last charged, I used it for 8 hours and it was on standby for 16. Now my battery's down to 50%. How much battery did I use when I used the phone? I'm thinking it's as simple as x + 2x = 50%.

Homework Statement A Vbatt = 1.5 V battery stores Ubatt = 2.25 kJ of energy. I want to replace this battery with a charged capacitor that stores the same amount of energy and puts out the same voltage. That is, I want a capacitor such that UC = 2.25 kJ and VC = 1.5 V. What must the capacitance...

During one of my labs we were using circuits. I connected a 9V battery in parallel with a 2.kΏ resistor and a multimeter. I meaured the current across the circuit and noticed it went really high at the beginning (about 30mA) and then it slowly went down and the battery became really hot and...

Homework Statement The circuit in the figure has a capacitor connected to a battery, two switches, and three resistors. Initially, the capacitor is uncharged and both of the switches are open. (a) Switch S1 is closed. What is the current flowing out of the battery immediately after switch S1...

Homework Statement How much energy must a 6.0 V battery expend to fully charge a 0.13 µF and a 0.21 µF capacitor when they are placed in the following configurations? Another question if anyone can help we get started on this one. I'm not sure where to begin How strong is the electric field...

Hi all, I have a doubt regarding electrolytic capacitor. Why the electrolytic capacitor should be connected to higher DC potential in the circuit. What happens if the opposite happens? Also how electrolytic capacitors must be used where varying voltage comes across it? -Devanand

I have taken apart a speaker set which uses a transformer to transform the 230-240v mains it receives into 9v AC 1A. I want to connect this circuit to a 9v battery. Nothing complicated-the standard Duracell one. Does anyone have any advice/comments on whether this will work or not? Regards...

Homework Statement A circuit is constructed with five resistors and one real battery as shown above right. We model. The real battery as an ideal emf V = 12 V in series with an internal resistance r as shown above left. The values for the resistors are: R1 = R3 = 30 Ω, R4 = R5 = 78 Ω and R2...

Homework Statement A circuit is constructed with five resistors and a battery as shown. The battery voltage is V = 12 V. The values for the resistors are: R1 = 75 Ω, R2 = 127 Ω, R3 = 129 Ω, and R4 = 130 Ω. The value for RX is unknown, but it is known that I4, the current that flows through...

Homework Statement A circuit is constructed with five resistors and a battery as shown. The battery voltage is V = 12 V. The values for the resistors are: R1 = 54 Ω, R2 = 142 Ω, R3 = 148 Ω, and R4 = 109 Ω. The value for RX is unknown, but it is known that I4, the current that flows through...

This isn't actually a homework/schoolwork question, but all the stickies on the other boards say that anything that is a school-work *type* question should go here. Not sure if this qualifies, but I figured I'd err on the side of caution. I took physics II last year and now I'm trying to do a...

If I had a big car battery and wanted to charge a smaller battery with it (say a laptop), how would I do that without breaking the laptop? First of all, a battery has a certain voltage and DC current which is the same thing a laptop battery uses, but you'd have to ditch the AC adapter because...

Hi, I am doing a project of making an electric car while using two DC Hub motors of 36V (750W power) each, one on each rare wheel. I intend to use a single Lithium ion battery of 48V and 32 Amph to operate both the hub motors. Please tell me 'can a 48V & 32Amp Battery operate Two Hub...

Question for fun. A car's battery is not a capacitor, but it seems to "accumulates" charge the same way. So, if you take a typical fully charged car's battery, what would be the equivalent capacitance of a 12V capacitor that would have the same charge? For an extra kick - try to...

Hallo, I want to know if the iPhone battery loses power over time? Does it lose power the more you use it?

hi all, I'm designing a hybrid motorcycle and want to select a battery for that. Can anyone tell me what will be the input parameter for the selection of the battery the motorcycle?

Hello: I have a basic query, regarding the charging and usage of battery. When I charge a battery it needs some energy, say 100 watt. Does the charged battery now will provide me back 100 watt (or more or less)? My confusion is specially due to, we use invertors in most of the places to...

I'm working on a project that has a 7.4v rechargeable battery pack and I am going to recharge the pack with a solar cell. If the solar cell is only capable of outputing no more than about 2v, is it at all possible to charge the battery pack? Thanks!

There's three lamps in a series circuit, which are rated 0.05A, 6v. What size of current will be drawn from the battery pack. Explain why this is. You need to please reply quickly. I've got lots of homework to do still and it's 9.00pm nearly. Sorry for being a bit impatient, but I really...

Hi I have a wish to "create" a battery that I can use as replacement for a regular power adapter. Main reason I want to do this is to get something that will be mobile with my PC (HP Touch Smart) Input: 100-240, 2A, 50-60 HZ Output: 19V, 7.9A, 150W What technical solutions am I looking...

Homework Statement Which of the following batteries has the most stored charge? Their ratings are shown below. Explain your answer. a) 12V, 500mAh b) 1.2V, 1200uAh c) 6V, 3.14159x10e17 electrons d) 6V, 0.01MAh 2. The attempt at a solution I think the answer is d because 0.01MAh = 10,000Ah...

I'm trying to charge my cellphone and would like to know how many volts would cause the cellphone battery damage? Also, how many amps would an average phone need to be charged?

Hello every one:smile: I would like some help regarding building a battery powered heater. Let me describe the problem first I shoot air rifles as a hobby and am restricted to 12foot pound of muzzle energy here in the UK One of my rifles that I prefer to shoot is CO2 powered...

Can anyone tell me how to wire a momentary normally open switch to a battery operated device (4 AA batteries) like this one? http://www.scientificsonline.com/mini-plasma-ball.html Is it even possible? Any advice appreciated!

So I have an idea and was wondering if anyone here could help me understand some of the physics behind trying to make it work before I buy up some materials and experiment. All the google searches I did with various keywords kept hitting here so... I have a battery, let's say it is 7.4V and...

Hello forum, a battery is a voltage source: it provides constant voltage, regardless of the load connected to it. there is also a current source: it provides constant current, regardless of the connected load. Is there something like a power source, something that outputs constant...

While I was looking at an example of the Biot-Savart Law for a finite, straight wire of current, I started considering whether one can easily create one in practice. If I hooked up the positive terminal of a 9 V battery by a resistance to the negative terminal of another 9 V battery, would...

What is the speed of electron flow in an eletric curcuit? A battery (cell) with a copper wire shorted across the positive and negative posts. What will the electron flow be through the copper wire?

Homework Statement Obviously I do not believe this to be the case, but when running a car the battery is I assume having current drawn in, reversing its normal means of depletion so that the potential chemical reaction can take place later on. My question is when you turn on the radio while...

Well i couldnot help out with the concept that conventional tubes for x ray production require high acceleration voltages in the order of kVs but how a portable XRF produces x rays with a rechargeable battery ?? Does it produce high enough accelerationn pressure, i have some doubts or there is...

This would be fun to know. So, if I need to leave my house quickly, is it worth it to throw my dead phone on the charger for 10 minutes because that initial charge time is the most efficient, or is charge a linear relation with time?

Homework Statement A battery with voltage V=12V is connected to the primary of a transformer. A resistor with resistance R =20 Ohms is connected to the transformer secondary. The transformer has an iron core with Np=200 turns on the primary and Ns=600 turns on the secondary. Assume the...

Homework Statement so the problem, along with the figure, can be found http://www.cramster.com/answers-nov-09/physics/problem-3268-12-car-battery-dies-somuch-volt_697332.aspx?rec=0 Homework Equations I=V/R, The Attempt at a Solution I am able to calculate parts a and b...

Hi I have what seems to be a untractable problem On a racing motorcycle I am using a total loss ingition/datalogging and water pump system. To power this I am using a 5000Ma 30C LiPo battery (used because of it light weight and small size). The measured battery output is 15.2 Volts. Both the...

Hi all, I am trying to determine what is the maximum number of amps I can charge 4 batteries that are in parallel and series ( 4x12V batteries) to produce 24 volts. I have the specs on the batteries and everything but can not seem to determine how many amps they can handle when being...