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Appliances and Power

In this worksheet, students will learn about energy transfer in appliances and will compare power ratings of appliances in watts (W).

'Appliances and Power' worksheet

Key stage:  KS 3

Curriculum topic:   Physics: Energy

Curriculum subtopic:   Calculation of Fuel Uses and Costs

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

Many of the electrical appliances used at home transfer electrical energy into different forms of energy.

 

The energy that a machine uses each second is called its power. All appliances have a power rating in watts (W) or kilowatts (kW). The higher the power of the appliance, the more energy it uses. The amount of energy used by an appliance depends on its power and the time the appliance works for.

 

Electricity meter

 

Electricity at home is sold by the kilowatt-hour. This is the energy used by a device running at 1000 W for 1 hour. The table below shows various electrical appliances and their power ratings.

 

Electrical appliances

 

Appliance Power Rating (W)
Electric cooker hob (one ring) 2000
Electric cooker oven 1500-2500
Microwave oven 600-900
Washing machine 2750
Vacuum cleaner 800-1200
Toaster 1200
Kettle 1200-2200
Hair dryer 1000
Plasma television 328
Fridge 110
Computer 78
Play Station 30
Energy efficient light bulb 15
Charging mobile phone 3

 

Use this information as we explore appliances and the energy they use.

 

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