Questions
A 10V, 1.5Ω cell is connected in series with a variable resistance R whose value can be varied from zero to 1Ω. If ‘R’ is made to gradually increase from zero to 10 Ω, power dissipated in R.
detailed solution
Correct option is B
Power consumed in the external circuit is maximum when R = internal resistance of the cell i.e. when R = 1.5 Ω. Initial power is zero and final power is 1010+1.52×10 watt.Talk to our academic expert!
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A resistor R is connected across a battery of emf 12 V. It observed that terminal potential differenceis 9 V and the power delivered to resistor is 18 W. Internal resistance of the battery ‘r’ and the resistance R are respectively
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