Answer :
A light bulb uses 30 W when connected to 3 V battery. If it is connected to a 6 V battery it will use power of 60 W. The answer is (d) 60 W.
The power consumed by a light bulb is calculated using the formula P=V²/R, where P is power, V is voltage, and R is resistance. Since the light bulb is a constant resistance device, we can use the formula P=V²/R to find the power consumed by the bulb.
When connected to a 3 V battery, the power consumed by the bulb is P=(3²)/R=9/R=30 W. Solving for R, we get R=9/30=0.3 ohms. When connected to a 6 V battery, the power consumed by the bulb is:
P=(6²)/0.3=36/0.3=120 W. Therefore, the answer is (d) 60 W, which is half of 120 W.
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