Posted by **Kate** on Wednesday, August 26, 2009 at 11:03pm.

I'm stumped on what formula to use for the following question.

A 1.5V battery does 4.5*10^2 J of work in 120s.

Calculate the current through the battery

Calculate the number of elementary charges that pass through the battery.

I've been trying to figure out the formula to start with and would really appreciate some help.

- Physics -
**DrBob222**, Thursday, August 27, 2009 at 12:10am
volts = joules/coulomb and

coulomb = amp*sec so

volts = joules/amp*sec.

- Physics -
**Kate**, Thursday, August 27, 2009 at 12:18am
So I solve for a=J/v*s to get the current (4.5*10^2/1.5*120). I hope I got this right and thanks very much.

- Physics -
**drwls**, Thursday, August 27, 2009 at 1:56am
Your formula will give you the number of Amperes of current. Divide that by the electron charge (1.6*10^-19 Coulombs) to get the rate that electrons pass through. Multiply that by 120s for the number of electrons.

- Physics -
**Kate**, Thursday, August 27, 2009 at 1:12pm
Thanks!

## Answer This Question

## Related Questions

- Multiple Choice - Physics 2. Which of the following is equivalent to one ampere...
- Chemistry - A zinc-copper battery is constructed as follows at 25°C. Zn|Zn^2+ (0...
- Chemistry -please help! - A zinc-copper battery is constructed as follows at 25°...
- Physics - A battery charger is connected to a dead battery and delivers a ...
- FGS - Two bulbs each of resistance 2.0ohms are connected in parallelwith a ...
- physics- electricity - An electric car uses a lithium metal hydride battery with...
- physics - A 8 V flashlight battery has an internal resistance of 1.7 Ω when...
- college chemistry - A zinc-copper battery is constructed as follows: Zn | Zn+2(0...
- physical science - the headlamp and 2 identical tail lamp are conected in ...
- physics - Suppose a battery output a voltage of 9 volt. Calculate how many ...

More Related Questions