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

A circuit:

Battery (1.5v) -- Battery (1.5v) -- Lamp(18 Ohm) and back to the first battery.

The circuit is producing 0.25 Watt to the lamp. what is the inside-resistance of the batteries?

2. Relevant equations

P=VI

IR=V

3. The attempt at a solution

1.5+1.5=3Volt

P=0.25Watt

0.25=3*I

I=1/12

(1/12)*R=3

R=36

we already have 18 Ohms from the lamp so the remining 36-18=18 is the answer.

WRONG

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# A battery-battery-resistor circuit

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