Questions
A torch bulb rated as 4.5 W, 1.5 V is connected as shown in fig. The e.m.f. of the cell, needed to
make the bulb glow at full intensity is
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Correct option is D
Resistance of bulb Rb=(1⋅5)24⋅5=0⋅5ΩCurrent drawn from battery =E2⋅67+0⋅33=E3Share of bulb 23×E3=2E9∴ 2E92×0⋅5=4⋅5or E=13⋅5VSimilar Questions
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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