Question

an electric kettle of rating 2.5kW. calculate the amount of energy consumed in 5 minutes

Answer 1

Given the electric kettle rating, the amount of energy consumed in the given time is 750 Kilojoules.

What is the amount of energy consumed in 5 minutes?

The consumption of energy per unit of time is called power. It is expressed as;

P = E / t

Given that;

• Power P = 2.5kW = ( 2.5 × 1000 )W = 2500W

• Time elapsed t = 5min = ( 5 × 60 ) = 300s

• Energy = ?

P = E / t

E = P × t

E = 2500W × 300s

E = 750,000J

E = 750kJ

Given the electric kettle rating, the amount of energy consumed in the given time is 750 Kilojoules.

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Answer 2

The amount of energy consumed by the kettle in 5 mins is 750000 J

What is power?

This is defined as the rate in which energy is consumed. Electrical power is expressed mathematically as:

Power = Energy / time

How to determine the energy

• Power = 2.5 KW = 2.5 × 1000 = 2500 W
• Time = 5 mins = 5 × 60 = 300 s
• Energy = ?

Energy = Power × time

Energy = 2500 × 300

Energy = 750000 J

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