Current Electricity and Electrical InstrumentMedium
Question
A battery of internal resistance 2W is connected to a variable resistor whose value can vary from 4W to 10 W. The resistance is initially set at 4W. If the resistance is now increased then -
Options
A.Power consumed by it will decrease
B.Power consumed by it will increase
C.Power consumed by it may increase or may decrease
D.Power consumed will first increase then decrease
Solution
P = I2R = 
ε is constant and (R + r) increases rapidly Then P ↓
ε is constant and (R + r) increases rapidly Then P ↓
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