A battery of internal resistance 2 Ω is connected to a variabte resistor whose value can vary from 4 Ω to 10 Ω. The resistance is initially set at 4 Ω. If the resistance is now increased, then
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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 by it will first increase then decrease
answer is A.
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Detailed Solution
P=I2R=VR2=ε2R+r2Rε is constant and (R + r) increases rapidly, then P ↓.
A battery of internal resistance 2 Ω is connected to a variabte resistor whose value can vary from 4 Ω to 10 Ω. The resistance is initially set at 4 Ω. If the resistance is now increased, then