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WorksheetsScPhys Practical Electricity Quiz 1
Total questions: 7
Worksheet time: 31mins
An electric heater takes a current of 4 A from a 250 V supply when operating normally. How long would it take the heater to convert 400 000 J of electrical energy?
400 s
1 000 s
1 600 s
100 000 s
Electric energy produced by light a bulb with resistance of 6 ohm when it is passed by electric current for 60 second is 1440 J, the electric current flowing through the light bulb is ….
4 A
3 A
2 A
1 A
The cost of electricity is 27 cents per kWh. What is the cost of using a 1000–1200 W iron at maximum power for 45 minutes?
(a) cents (3.s.f)
The cost of using electricity in a household in a 30 day-month is $165.
What is the cost of a unit electricity if the only appliance used was a 2 500 W
air-con operated from 9 pm to 7 am daily?
(a) cents
Calculate the energy consumption of an electrical appliance that consumes 500 watts for 5 hours in kWh.
(a) kWh
Calculate the annual cost of operating a ceiling fan that consumes 75 watts for 8 hours daily, with electricity priced at $0.18 per kWh in 2 d.p
$ (a)
Calculate the monthly cost (1 month = 30 days) of operating a hairdryer for 15 minutes daily, consuming 1200 watts, with electricity priced at $0.25 per kWh (in 3 s.f.)
$ (a)
