Transferring Electrical Energy Worksheet Page 23
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46(b)
Electrical appliances left on standby use energy.
The bar chart shows the power for the appliances that one family leaves on standby when
they go on holiday.
The family is on holiday for a total of 175 hours.
(i)
Use the information in the bar chart and the equation in the box to calculate the
energy wasted by leaving the compact stereo on standby while the family is on
holiday.
energy transferred
=
power
×
time
(kilowatt-hour, kWh)
(kilowatt, kW)
(hour, h)
Show clearly how you work out your answer.
...........................................................................................................................
...........................................................................................................................
Energy wasted = .............................. kilowatt-hours
(2)
(ii)
Electricity costs 12 p per kilowatt-hour.
Use the equation in the box to calculate the cost of leaving the compact stereo on
standby while the family is on holiday.
total cost = number of kilowatt-hours × cost per kilowatt-hour
Show clearly how you work out your answer.
...........................................................................................................................
Cost = .............................. p
(1)
Page 23 of 46
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