The cost of electricity is 30.13 cents per kWh .
Calculate the cost of using a 650 W air conditioner for 6 hours. (2 marks)
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Measurement, STD2 M7 2021 HSC 27
The price and the power consumption of two different brands of television are shown.
The average cost for electricity is 25c/kWh. A particular family watches an average of 3 hours of television per day.
- The annual cost of electricity for Television A for this family is $48.18.
- For this family, what is the difference in the annual cost of electricity between Television A and Television B? (2 marks)
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- For this family, how many years will it take for the total cost of buying and using Television A to be equal to the cost of buying and using Television B? (2 marks)
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Measurement, STD2 M7 2018 HSC 28c
Every day, a 1200-watt microwave oven is used for 45 minutes at 40% power. Electricity is charged at $0.25 per kWh.
What is the cost of running this microwave oven for 180 days? (3 marks)
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Measurement, STD2 M7 SM-Bank 1
Bikram runs a hot yoga studio.
If it costs 34 cents for 1-kilowatt (1000 watts) for 1 hour, how much does it cost him to run three 3200-watt heaters from 9:00 am to 12:30 pm on a single day? (Give your answer to the nearest cent) (2 marks)
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Measurement, STD2 M1 SM-Bank 3
A 250-watt television is turned on for an average of 4 hours per day during off-peak periods for a week.
If the television is not running at any other time and electricity is charged at $0.36/kWh during off-peak, how much does it cost to run the television for a week? (2 marks)
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Measurement, STD2 M1 2017 HSC 26a
Electricity costs $0.27 per kWh.
How much does 20 kWh cost? (1 mark)
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Measurement, STD2 M1 2016 HSC 28b
The cost of buying a new heater is $990. It has an energy consumption of 505 kWh per year.
Energy is charged at the rate of $0.35 kWh.
How much will it cost in total to purchase and then run this heater for five years? (2 marks)
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Measurement, STD2 M1 2015 HSC 30a
The energy consumption of a computer in standby mode is 21 watts. The cost of electricity is 31 cents per kWh.
A school computer room has 20 computers.
How much will the school save by switching off all 20 computers during 11 weeks of school holidays? (2 marks)
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Measurement, STD2 M1 2014 HSC 20 MC
In a household of 4, each member uses an average of 13 minutes of hot water per day.
The household uses a 9 kW hot water unit.
Electricity is charged at 11.97 c/kWh when the hot water unit is being used.
What is the electricity cost for the hot water used by this household in one week?
- $1.63
- $6.54
- $392.14
- $653.56
Measurement, STD2 M1 2013 HSC 26d
A section of Jim’s electricity bill is shown.
- What is the value of
? (1 mark)
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- How much will Jim save if he uses 154 kWh of energy at the Off-peak rate rather than at the Peak rate? (2 marks)
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