(a) What is the meaning of the symbol kWh ? What quantity does it represent ?

(b) How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes ?

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Solution

a)kWh means kilowatt-hour. It represents the electrical energy consumed.

b)
Power, P=1000 W=1 kW

time, t=60 min=1 h

Energy, E=P×t

E=1×1=1 kWh

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(a) What is the meaning of the symbol kWh ? What quantity does it represent ? (b) How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes ?

a)kWh means kilowatt-hour. It represents the electrical energy consumed. b) Power, P=1000 W=1 kW time, t=60 min=1 h Energy, E=P×t E=1×1=1 kWh

(a) What is the meaning of the symbol kWh ? What quantity does it represent ?

(b) How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes ?

a)kWh means kilowatt-hour. It represents the electrical energy consumed.

b)
Power, P=1000 W=1 kW

time, t=60 min=1 h

Energy, E=P×t

E=1×1=1 kWh