(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A battery has an EMF of 12.0 volts and internal resistance of 3 ohms

A 21.0 ohm resistance is connected to the battery.

0.5 Amps flow through the battery, hence 0.5 Amps flows through the 21.0 ohm resistor

The potential difference across the 21 ohm resistor is 10.5 Volts, hence the terminal voltage of the battery is 10.5 Volts.

The question is How much work does the battery connected to the 21.0 ohm resisitor perform in one minute?

2. Relevant equations

Voltage = Joule/coloumb

1 amp = coloumb/ second = (6.258 *10^18 electrons) second

1 electron has a charge -1.60*10^-19 coloumbs

3. The attempt at a solution

current = 0.5 Amps = 3.125*10^18 electron/ second = 30 coloumbs pass wire per minute

usisng the definition of EMF (voltage): 30 coloumbs/ minute * 10.5 volts = 315 Joules

however it keeps on telling me that answer is wrong i know its simple i just can't see it right now thanx

**Physics Forums - The Fusion of Science and Community**

# How much work a battery does connected to a resistor

Know someone interested in this topic? Share a link to this question via email,
Google+,
Twitter, or
Facebook

Have something to add?

- Similar discussions for: How much work a battery does connected to a resistor

Loading...

**Physics Forums - The Fusion of Science and Community**