Questions
A torch bulb rated as 4.5 W, 1.5 V is connected as shown in the figure. The e.m.f. of the cell needed to make the bulb glow at full intensity is
detailed solution
Correct option is D
Current in the bulb =PV=4.51.5=3ACurrent in 1 Ω resistance =1.51=1.5 AHence, total current from the cell, i = 3 + 1.5 = 4.5 ABy using E=V+ir ⇒ E=1.5+4.5 × 2.67 = 13.5 VTalk to our academic expert!
Similar 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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