Question

an electric bulb is rated as 100 watt 220 volts it is used for 5 hours daily calculate (i)its resistance while glowing (ii) energy consumed in a kWh per day​

Answer 1

Power = 100W

Voltage = 220V

Time used = 5hrs

P = I²R

= V²/R

100 = (220)²/ R

R = 48400/100 = 484 ohm

E = Power × time = 220 × 5 = 1100 Wh

= 1.1 kWh

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Answer 2

Answer:

(i) R= 484 ohm

(ii) E= 1.1 KWh

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