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5 Cards in this Set
- Front
- Back
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The devices below transform electrical energy into other forms of energy. 1 Food processer 2 Torch 3 Iron 4 CaSpeaker The list gives the useful form of energy the devices are designed to produce. Match the words in the list with the devices numbered 1 to 4. |
A kinetic energy .................... B light .................... C sound .................... D thermal energy .................... |
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A 3 kW electric motor is switched on for 15 minutes. How much energy, in kilowatt hours, does it transfer during this time?<?xml:namespace prefix = o />
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A 0.0075 kWh B 0.075 kWh<?xml:namespace prefix = o /> C 0.75 kWh D 7.50 kWh |
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Which of the following does not represent a unit of energy? |
A J B kJ<?xml:namespace prefix = o /> C kW D kWh |
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The diagram shows the readings on a household electricity meter, in kWh, at the beginning and end of one week. Each kWh of electricity costs 8p. |
1<?xml:namespace prefix = o /> 8 2 4 2
1 8 5 1 1
At the beginning of the week At the end of the week
(a) How many kWh of electricity were used during the week?
A 242 B 269 C 511 D 753
(b) On one day 30 kWh of electricity were used. How much would this electricity cost?
(c) During the week a 2 kW iron was used for 2.5 hours. How much energy was transformed by the iron?
(d) How much does it cost to use a 9 kW shower for half an hour?
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A student uses an 2KW1b electric iron. |
(a) What useful energy transformation takes place in the iron?<?xml:namespace prefix = o />
(b) Electricity cost 8 p per kWh. How much does it cost the student to use the iron for 30 minutes?
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