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An energy source forces a constant current of 2 A for 10s to flow through a light bulb. If 2.3 kJ is given off in the form of light and heat energy, what is the voltage drop across the bulb ?  

An energy source forces a constant current of 2 A for 10s to flow through a light bulb. If 2.3 kJ is given off in the form of light and heat energy, what is the voltage drop across the bulb ?   Correct Answer 115 V

We know that

The total charge is given by

Δq = I Δt

Where Δq = change in charge, I = current, Δt = change in time, ΔW = Change in energy

∴ Δq = I Δt = 2 × 10 = 20 C

The voltage drop is given by

V = ΔW/Δq

∴ V = (2.3 × 103) /20 = 115 V

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