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 SM-Bank 12
Francis is buying a fridge. The energy usage of his two choices are below:
Fridge 1 (5 star rating): 227 kWh per year
Fridge 2 (2 star rating): 492 kWh per year
Each fridge has an expected life of 8 years.
If electricity costs 32.4 cents per kWh, how much will Francis save in electricity over the expected life of the more energy efficient fridge, to the nearest dollar? (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 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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