A 1 kW heater is meant to operate at 200 V. a. what is the resistance ? b. How much power will it consume if the line voltage drops to 100 V ? c. How many units of electrical energy will it consume in a month ( of 30 days) if it operates 10 h daily at the specified voltage (200 V) ?
Open in App
Verified by Toppr
a. The resistance of electric appliance is given by R=P0Vs2=1000(200)2=40Ω b. The 'actual power' consumed by an electric appliance is given by P=(V5VA)2×P0=(200100)2×1000=250W c. The total electrical energy consumed by an electric appliance in a specified time is given bt E=1000∑wihikWh=10001000×(10×30)=300kWh