Question

An electric bulb is rated at 60 watt, 240 volt calculate its resistance if the voltage drops to 192 volt calculate the power consumed and the current drawn by the bulb

Answer 1

Originally :

Power = 60 W .

Voltage = 240 v .

Current = power / voltage

             = 60 W / 240 v

             = 1/4 A

             = 0.25 A

If voltage became 192 v

Power = voltage × current

           = 192 v × 0.25 A

           = 192 v × 1/4 A

           = 48 W

ANSWER:

48 W will be the current.