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WorksheetYear 10Level 3 · Challenge

Free Year 10 Electrical Power, Energy and the Cost of Electricity Worksheet

Students calculate electrical power with P = VI and P = E ÷ t, convert between joules and kilowatt-hours, and find the current drawn by household appliances. They read electricity meter values, calculate the running cost of appliances in cents and dollars, compare the yearly cost of LED and incandescent light bulbs and evaluate ways a household can reduce its electricity use.

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Year
Year 10
Subject
Science
Topic
Energy, Light, Sound & Electricity
Difficulty
Level 3 · Challenge
Estimated time
45 minutes
Curriculum
Australian Curriculum
Questions
15
Answers
Included, with working
Format
PDF (A4), print or complete online

Students will practise

  • calculating power using P = VI and P = E ÷ t
  • converting between joules and kilowatt-hours
  • calculating energy use from power ratings and time
  • calculating the cost of electricity
  • evaluating ways to reduce household energy use

Curriculum: Australian Curriculum. We show specific outcome codes only where they have been verified against the official curriculum document.

What's next?

Completed: Electrical Power, Energy and the Cost of Electricity

  1. 1Specific Heat Capacity Calculations: Q = mcΔT

How to use this worksheet

  1. Print the PDF or complete it on screen. Write the student's name and date at the top.
  2. Read the instructions for each part together before starting. Encourage working to be shown.
  3. Mark with the answer sheet. Use the model answers and success criteria as a guide rather than a single right answer.
  4. Record the score, celebrate what went well, then follow the "What's next" suggestion.

Common questions

Who is this worksheet for?

Year 10 students (typically ages 15–16) working on energy, light, sound & electricity. It is pitched at level 3 · challenge.

Are the answers included?

Yes. The PDF includes a full answer sheet with model answers and success criteria where there is more than one good answer. You can also view the answers online.

How long does it take?

About 45 minutes for 15 questions. Short, regular sessions work best: two or three a week beats one long one.

Do I need to sign up to download?

No. Click Download Free PDF and it opens immediately. It is free for personal, classroom and homeschool use.

What should we do next?

Try Specific Heat Capacity Calculations: Q = mcΔT.

Preview

Success TutoringWorksheetsYear 10 · Science · Energy, Light, Sound & Electricity

Electrical Power, Energy and the Cost of Electricity

Name

Date

Score /

Use kW and hours to get kWh; use W and seconds to get joules.

Part A: Power, voltage and current

Power is the rate at which energy is transferred, measured in watts (W); 1 W = 1 joule per second. For an electrical device, P = VI (power = voltage × current).

Also, P = E ÷ t, so E = P × t (energy = power × time).

1.A kettle has a power rating of 2000 W and runs on a 230 V supply. Calculate the current it draws, to one decimal place.
2.A microwave oven draws 5 A from a 230 V supply. What is its power?
3.A 12 V car headlight draws a current of 0.5 A. What is its power?
4.What does a power rating of 1 watt mean?
  1. A1 joule of energy is transferred every second
  2. B1 coulomb of charge flows every second
  3. C1 volt pushes 1 amp
  4. D1 kilowatt-hour is used every hour
5.A phone charger on a 230 V supply draws 0.05 A. Calculate its power, and the energy it transfers in one hour in joules.

Part B: Joules and kilowatt-hours

The joule is a very small unit, so electricity companies measure energy in kilowatt-hours (kWh). Energy (kWh) = power (kW) × time (h). 1 kWh = 1000 W × 3600 s = 3 600 000 J.

Cost = energy used (kWh) × price per kWh.

6.A 1500 W hair dryer is used for 10 minutes. How much energy does it transfer in joules?
7.Convert your answer to kilowatt-hours.
8.A 2 kW kettle is used for 6 minutes. Electricity costs 30 cents per kWh. How much does it cost to boil the kettle?
9.A kilowatt-hour is a unit of power. ☐ True   ☐ False

Part C: Household electricity costs

10.An electricity meter read 45 672 kWh at the start of a month and 45 912 kWh at the end. At $0.30 per kWh, what is the cost for the month?
11.A 2.4 kW heater is used for 1.5 hours each day for 30 days. At $0.30 per kWh, what does it cost to run?
12.A 60 W incandescent light bulb and an 8 W LED bulb give the same light. Each is used 5 hours a day for a year (365 days). Calculate the energy each uses in kWh and the yearly saving from using the LED, at $0.30 per kWh.
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Preview — the PDF contains the full resource and answer sheet.

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About this resource

Created by
Success Tutoring Science Team
Last reviewed
1 October 2026
How it was made
Written by our team

Free to print and share for personal, classroom and homeschool use. Please don't resell. Spotted an error? Let us know.