Question

which one has more resistance: 1kwh heater or a 100 watts tungsten bulb ,both marked as 230 v?

Answer 1

Answer: Hope its clear

Explanation:

                 Power of the heater = 1Kwh

                 P1    = 1000 W

               

                  Power of the tungsten bulb

                 P2 = 100 W

Resistance of the heater = $v^{2}$/P1

                                         =$230^{2}$/1000

                                         =52.9 ohm

Resistance of the tungsten bulb = $v^{2}$/P2

                                         =$230^{2}$/100

                                         =529 ohm

Therefore 100 W bulb has greater resistance.