(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' symbol means kilowatt hour. kWh is a unit of energy. 1 kWh means the energy consumed when 1-kilowatt is used for 1 hour.

(b) The electrical energy consumed by the appliance = Power of the appliance $\times$ Time

= 1000 W $\times$ 60 $\times$ 60 s

= 3.6 $\times$ 10⁶J

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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' symbol means kilowatt hour. kWh is a unit of energy. 1 kWh means the energy consumed when 1-kilowatt is used for 1 hour. (b) The electrical energy consumed by the appliance = Power of the appliance × Time = 1000 W × 60 × 60 s = 3.6 × 106 J

(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' symbol means kilowatt hour. kWh is a unit of energy. 1 kWh means the energy consumed when 1-kilowatt is used for 1 hour.

(b) The electrical energy consumed by the appliance = Power of the appliance $\times$ Time

= 1000 W $\times$ 60 $\times$ 60 s

= 3.6 $\times$ 10⁶J