ScienceAges 13-15

Electrical energy (kWh) & cost

Convert appliance power and operating time into kilowatt-hours (kWh) and calculate total electricity billing cost. Review suitability for your learners before teaching.

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Age band:Ages 13-15 Ages 16-18

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Worksheet StudioPractice pack · Ages 13-15

Electrical energy (kWh) & cost

Take your time. Show your thinking.

1. An electrical appliance rated at 1 kW is switched on for 22 hours. If electricity costs 15 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1 kW × t = 22 h = 22 kWh · Tariff: 15¢/kWh → Cost = ?
2. An electrical appliance rated at 4 kW is switched on for 16 hours. If electricity costs 20 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 4 kW × t = 16 h = 64 kWh · Tariff: 20¢/kWh → Cost = ?
3. An electrical appliance rated at 1 kW is switched on for 6 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1 kW × t = 6 h = 6 kWh · Tariff: 25¢/kWh → Cost = ?
4. An electrical appliance rated at 1.5 kW is switched on for 24 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1.5 kW × t = 24 h = 36 kWh · Tariff: 30¢/kWh → Cost = ?
5. An electrical appliance rated at 4 kW is switched on for 14 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 4 kW × t = 14 h = 56 kWh · Tariff: 25¢/kWh → Cost = ?
6. An electrical appliance rated at 3 kW is switched on for 20 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 3 kW × t = 20 h = 60 kWh · Tariff: 45¢/kWh → Cost = ?
7. An electrical appliance rated at 1 kW is switched on for 12 hours. If electricity costs 10 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1 kW × t = 12 h = 12 kWh · Tariff: 10¢/kWh → Cost = ?
8. An electrical appliance rated at 1 kW is switched on for 22 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1 kW × t = 22 h = 22 kWh · Tariff: 30¢/kWh → Cost = ?
9. An electrical appliance rated at 3 kW is switched on for 20 hours. If electricity costs 35 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 3 kW × t = 20 h = 60 kWh · Tariff: 35¢/kWh → Cost = ?
10. An electrical appliance rated at 2.5 kW is switched on for 24 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2.5 kW × t = 24 h = 60 kWh · Tariff: 30¢/kWh → Cost = ?
11. An electrical appliance rated at 2.5 kW is switched on for 8 hours. If electricity costs 20 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2.5 kW × t = 8 h = 20 kWh · Tariff: 20¢/kWh → Cost = ?
12. An electrical appliance rated at 2.5 kW is switched on for 18 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2.5 kW × t = 18 h = 45 kWh · Tariff: 45¢/kWh → Cost = ?

12 questions · Seed 43 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 13-15

Electrical energy (kWh) & cost

Answers and reasoning. Review before teaching.

1. An electrical appliance rated at 1 kW is switched on for 22 hours. If electricity costs 15 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
330 cents
Electrical energy E = P × t = 1 kW × 22 h = 22 kWh. Total cost = 22 kWh × 15 cents/kWh = 330 cents.
2. An electrical appliance rated at 4 kW is switched on for 16 hours. If electricity costs 20 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1280 cents
Electrical energy E = P × t = 4 kW × 16 h = 64 kWh. Total cost = 64 kWh × 20 cents/kWh = 1280 cents.
3. An electrical appliance rated at 1 kW is switched on for 6 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
150 cents
Electrical energy E = P × t = 1 kW × 6 h = 6 kWh. Total cost = 6 kWh × 25 cents/kWh = 150 cents.
4. An electrical appliance rated at 1.5 kW is switched on for 24 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1080 cents
Electrical energy E = P × t = 1.5 kW × 24 h = 36 kWh. Total cost = 36 kWh × 30 cents/kWh = 1080 cents.
5. An electrical appliance rated at 4 kW is switched on for 14 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1400 cents
Electrical energy E = P × t = 4 kW × 14 h = 56 kWh. Total cost = 56 kWh × 25 cents/kWh = 1400 cents.
6. An electrical appliance rated at 3 kW is switched on for 20 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
2700 cents
Electrical energy E = P × t = 3 kW × 20 h = 60 kWh. Total cost = 60 kWh × 45 cents/kWh = 2700 cents.
7. An electrical appliance rated at 1 kW is switched on for 12 hours. If electricity costs 10 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
120 cents
Electrical energy E = P × t = 1 kW × 12 h = 12 kWh. Total cost = 12 kWh × 10 cents/kWh = 120 cents.
8. An electrical appliance rated at 1 kW is switched on for 22 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
660 cents
Electrical energy E = P × t = 1 kW × 22 h = 22 kWh. Total cost = 22 kWh × 30 cents/kWh = 660 cents.
9. An electrical appliance rated at 3 kW is switched on for 20 hours. If electricity costs 35 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
2100 cents
Electrical energy E = P × t = 3 kW × 20 h = 60 kWh. Total cost = 60 kWh × 35 cents/kWh = 2100 cents.
10. An electrical appliance rated at 2.5 kW is switched on for 24 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1800 cents
Electrical energy E = P × t = 2.5 kW × 24 h = 60 kWh. Total cost = 60 kWh × 30 cents/kWh = 1800 cents.
11. An electrical appliance rated at 2.5 kW is switched on for 8 hours. If electricity costs 20 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
400 cents
Electrical energy E = P × t = 2.5 kW × 8 h = 20 kWh. Total cost = 20 kWh × 20 cents/kWh = 400 cents.
12. An electrical appliance rated at 2.5 kW is switched on for 18 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
2025 cents
Electrical energy E = P × t = 2.5 kW × 18 h = 45 kWh. Total cost = 45 kWh × 45 cents/kWh = 2025 cents.

12 questions · Seed 43 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 13-15

Electrical energy (kWh) & cost

Take your time. Show your thinking.

1. An electrical appliance rated at 1 kW is switched on for 22 hours. If electricity costs 15 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1 kW × t = 22 h = 22 kWh · Tariff: 15¢/kWh → Cost = ?
2. An electrical appliance rated at 4 kW is switched on for 16 hours. If electricity costs 20 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 4 kW × t = 16 h = 64 kWh · Tariff: 20¢/kWh → Cost = ?
3. An electrical appliance rated at 1 kW is switched on for 6 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1 kW × t = 6 h = 6 kWh · Tariff: 25¢/kWh → Cost = ?
4. An electrical appliance rated at 1.5 kW is switched on for 24 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1.5 kW × t = 24 h = 36 kWh · Tariff: 30¢/kWh → Cost = ?
5. An electrical appliance rated at 4 kW is switched on for 14 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 4 kW × t = 14 h = 56 kWh · Tariff: 25¢/kWh → Cost = ?
6. An electrical appliance rated at 3 kW is switched on for 20 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 3 kW × t = 20 h = 60 kWh · Tariff: 45¢/kWh → Cost = ?
7. An electrical appliance rated at 1 kW is switched on for 12 hours. If electricity costs 10 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1 kW × t = 12 h = 12 kWh · Tariff: 10¢/kWh → Cost = ?
8. An electrical appliance rated at 1 kW is switched on for 22 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1 kW × t = 22 h = 22 kWh · Tariff: 30¢/kWh → Cost = ?
9. An electrical appliance rated at 3 kW is switched on for 20 hours. If electricity costs 35 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 3 kW × t = 20 h = 60 kWh · Tariff: 35¢/kWh → Cost = ?
10. An electrical appliance rated at 2.5 kW is switched on for 24 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2.5 kW × t = 24 h = 60 kWh · Tariff: 30¢/kWh → Cost = ?
11. An electrical appliance rated at 2.5 kW is switched on for 8 hours. If electricity costs 20 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2.5 kW × t = 8 h = 20 kWh · Tariff: 20¢/kWh → Cost = ?
12. An electrical appliance rated at 2.5 kW is switched on for 18 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2.5 kW × t = 18 h = 45 kWh · Tariff: 45¢/kWh → Cost = ?

12 questions · Seed 43 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 13-15

Electrical energy (kWh) & cost

Answers and reasoning. Review before teaching.

1. An electrical appliance rated at 1 kW is switched on for 22 hours. If electricity costs 15 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
330 cents
Electrical energy E = P × t = 1 kW × 22 h = 22 kWh. Total cost = 22 kWh × 15 cents/kWh = 330 cents.
2. An electrical appliance rated at 4 kW is switched on for 16 hours. If electricity costs 20 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1280 cents
Electrical energy E = P × t = 4 kW × 16 h = 64 kWh. Total cost = 64 kWh × 20 cents/kWh = 1280 cents.
3. An electrical appliance rated at 1 kW is switched on for 6 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
150 cents
Electrical energy E = P × t = 1 kW × 6 h = 6 kWh. Total cost = 6 kWh × 25 cents/kWh = 150 cents.
4. An electrical appliance rated at 1.5 kW is switched on for 24 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1080 cents
Electrical energy E = P × t = 1.5 kW × 24 h = 36 kWh. Total cost = 36 kWh × 30 cents/kWh = 1080 cents.
5. An electrical appliance rated at 4 kW is switched on for 14 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1400 cents
Electrical energy E = P × t = 4 kW × 14 h = 56 kWh. Total cost = 56 kWh × 25 cents/kWh = 1400 cents.
6. An electrical appliance rated at 3 kW is switched on for 20 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
2700 cents
Electrical energy E = P × t = 3 kW × 20 h = 60 kWh. Total cost = 60 kWh × 45 cents/kWh = 2700 cents.
7. An electrical appliance rated at 1 kW is switched on for 12 hours. If electricity costs 10 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
120 cents
Electrical energy E = P × t = 1 kW × 12 h = 12 kWh. Total cost = 12 kWh × 10 cents/kWh = 120 cents.
8. An electrical appliance rated at 1 kW is switched on for 22 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
660 cents
Electrical energy E = P × t = 1 kW × 22 h = 22 kWh. Total cost = 22 kWh × 30 cents/kWh = 660 cents.
9. An electrical appliance rated at 3 kW is switched on for 20 hours. If electricity costs 35 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
2100 cents
Electrical energy E = P × t = 3 kW × 20 h = 60 kWh. Total cost = 60 kWh × 35 cents/kWh = 2100 cents.
10. An electrical appliance rated at 2.5 kW is switched on for 24 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1800 cents
Electrical energy E = P × t = 2.5 kW × 24 h = 60 kWh. Total cost = 60 kWh × 30 cents/kWh = 1800 cents.
11. An electrical appliance rated at 2.5 kW is switched on for 8 hours. If electricity costs 20 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
400 cents
Electrical energy E = P × t = 2.5 kW × 8 h = 20 kWh. Total cost = 20 kWh × 20 cents/kWh = 400 cents.
12. An electrical appliance rated at 2.5 kW is switched on for 18 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
2025 cents
Electrical energy E = P × t = 2.5 kW × 18 h = 45 kWh. Total cost = 45 kWh × 45 cents/kWh = 2025 cents.

12 questions · Seed 43 · Age guidance, not curriculum certification