Question

An electric bulb is rated at 60W, 240V. Calculate its resistance. If the voltage drops to 192V, calculate the power consumed and the current drawn by the bulb.(Assume that the resistance of the bulb remain unchanged)

Answer 1

Given ;
Power = 60 W
V = 240 V

P = V×I
P = V×(V/R)
P = V^2/R

60 = (240×240)/R
R = 4×24
R = 96 ohm
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Now,
V = 192 V
R = 96 ohm ----(as it remain unchanged)
P = ?

P = V^2/R
= (192×192)/96
= 384 W
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Hence the power consumed by the electric bulb is 384 Watt.

Answer 2

Answer:hope this might be helpful