- #1
zimo
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Homework Statement
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?
Homework Equations
P=VI
IR=V
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