Question

The current through a 16 V tungsten filament lamp connected to a 16 V accumulator of negligible resistance is 4.0 A calculate a) The resistance of filament b) The power of lamp c) The electrical energy in Kwh consumed in 6 hours

Answer 1

Ohm's Law

By Ohm's law , V = I R

Resistance of filament

R = V / I

Given :

V = 16 v

I = 4 A

R = 16 v / 4 A

  = 4 Ω

Resistance of the filament is 4 Ω

Power

We know that P = V I

                          = 16 v × 4 A

                          = 64 W

Power = 64 W

Electrical energy

Costing = 64 W × 6 hr

             = 384 W hr

              = 0 .384 kWhr

Hope it helps u:-)

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