An incandescent bulb is marked “60 W – 240 V”.

PHYSICS · Multi-part · A Level · Physics · Electricity · Electricity

Problem

An incandescent bulb is marked “60 W – 240 V”. (i) Calculate the resistance of its filament when it is glowing normally. (ii) If the bulb is connected to a 120 V supply and the resistance remains unchanged, what current will flow through it?

Related theory

Ohm's Law
Ohm's Law (Macroscopic)
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