Questions
Battery shown in figure has e.m.f. E and internal resistance r. Current in the circuit can be varied by sliding the contact J.If at any instant current flowing through the circuit is I, potential difference between terminals of the cell is V, thermal power generated in the cell is equal to
fraction of total electrical power generated in it, then which of the following graphs is correct?
detailed solution
Correct option is D
Terminal voltage V=E−Ir. Hence, the graph between V and I will be a straight line having negative slope and positive intercept.Thermal power generated in the external circuit, P=EI−I2r. Hence, graph between P and I will be a parabola passing through origin.Also at an instant, thermal power generated in the cell = I2r and total electrical power generated in the cell= Ei. Hence the fraction η =I2rEI=rEI; so η∝ I. means graph between η and I will be a straight line passing through origin.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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