ScienceAges 16-18

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 16-18

Electrical energy (kWh) & cost

Take your time. Show your thinking.

1. An electrical appliance rated at 1 kW is switched on for 4 hours. If electricity costs 10 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1 kW × t = 4 h = 4 kWh · Tariff: 10¢/kWh → Cost = ?
2. An electrical appliance rated at 2 kW is switched on for 10 hours. If electricity costs 15 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2 kW × t = 10 h = 20 kWh · Tariff: 15¢/kWh → Cost = ?
3. An electrical appliance rated at 2.5 kW is switched on for 20 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2.5 kW × t = 20 h = 50 kWh · Tariff: 25¢/kWh → Cost = ?
4. An electrical appliance rated at 2 kW is switched on for 10 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2 kW × t = 10 h = 20 kWh · Tariff: 30¢/kWh → Cost = ?
5. An electrical appliance rated at 2.5 kW is switched on for 18 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2.5 kW × t = 18 h = 45 kWh · Tariff: 25¢/kWh → Cost = ?
6. An electrical appliance rated at 1.5 kW is switched on for 8 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1.5 kW × t = 8 h = 12 kWh · Tariff: 45¢/kWh → Cost = ?
7. An electrical appliance rated at 4 kW is switched on for 16 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 4 kW × t = 16 h = 64 kWh · Tariff: 45¢/kWh → Cost = ?
8. An electrical appliance rated at 1.5 kW is switched on for 12 hours. If electricity costs 20 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1.5 kW × t = 12 h = 18 kWh · Tariff: 20¢/kWh → Cost = ?
9. An electrical appliance rated at 2.5 kW is switched on for 22 hours. If electricity costs 35 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2.5 kW × t = 22 h = 55 kWh · Tariff: 35¢/kWh → Cost = ?
10. An electrical appliance rated at 2 kW is switched on for 16 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2 kW × t = 16 h = 32 kWh · Tariff: 45¢/kWh → Cost = ?
11. An electrical appliance rated at 2 kW is switched on for 8 hours. If electricity costs 10 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2 kW × t = 8 h = 16 kWh · Tariff: 10¢/kWh → Cost = ?
12. An electrical appliance rated at 1.5 kW is switched on for 24 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1.5 kW × t = 24 h = 36 kWh · Tariff: 45¢/kWh → Cost = ?

12 questions · Seed 42 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 16-18

Electrical energy (kWh) & cost

Answers and reasoning. Review before teaching.

1. An electrical appliance rated at 1 kW is switched on for 4 hours. If electricity costs 10 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
40 cents
Electrical energy E = P × t = 1 kW × 4 h = 4 kWh. Total cost = 4 kWh × 10 cents/kWh = 40 cents.
2. An electrical appliance rated at 2 kW is switched on for 10 hours. If electricity costs 15 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
300 cents
Electrical energy E = P × t = 2 kW × 10 h = 20 kWh. Total cost = 20 kWh × 15 cents/kWh = 300 cents.
3. An electrical appliance rated at 2.5 kW is switched on for 20 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1250 cents
Electrical energy E = P × t = 2.5 kW × 20 h = 50 kWh. Total cost = 50 kWh × 25 cents/kWh = 1250 cents.
4. An electrical appliance rated at 2 kW is switched on for 10 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
600 cents
Electrical energy E = P × t = 2 kW × 10 h = 20 kWh. Total cost = 20 kWh × 30 cents/kWh = 600 cents.
5. An electrical appliance rated at 2.5 kW is switched on for 18 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1125 cents
Electrical energy E = P × t = 2.5 kW × 18 h = 45 kWh. Total cost = 45 kWh × 25 cents/kWh = 1125 cents.
6. An electrical appliance rated at 1.5 kW is switched on for 8 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
540 cents
Electrical energy E = P × t = 1.5 kW × 8 h = 12 kWh. Total cost = 12 kWh × 45 cents/kWh = 540 cents.
7. An electrical appliance rated at 4 kW is switched on for 16 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
2880 cents
Electrical energy E = P × t = 4 kW × 16 h = 64 kWh. Total cost = 64 kWh × 45 cents/kWh = 2880 cents.
8. An electrical appliance rated at 1.5 kW is switched on for 12 hours. If electricity costs 20 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
360 cents
Electrical energy E = P × t = 1.5 kW × 12 h = 18 kWh. Total cost = 18 kWh × 20 cents/kWh = 360 cents.
9. An electrical appliance rated at 2.5 kW is switched on for 22 hours. If electricity costs 35 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1925 cents
Electrical energy E = P × t = 2.5 kW × 22 h = 55 kWh. Total cost = 55 kWh × 35 cents/kWh = 1925 cents.
10. An electrical appliance rated at 2 kW is switched on for 16 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1440 cents
Electrical energy E = P × t = 2 kW × 16 h = 32 kWh. Total cost = 32 kWh × 45 cents/kWh = 1440 cents.
11. An electrical appliance rated at 2 kW is switched on for 8 hours. If electricity costs 10 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
160 cents
Electrical energy E = P × t = 2 kW × 8 h = 16 kWh. Total cost = 16 kWh × 10 cents/kWh = 160 cents.
12. An electrical appliance rated at 1.5 kW is switched on for 24 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1620 cents
Electrical energy E = P × t = 1.5 kW × 24 h = 36 kWh. Total cost = 36 kWh × 45 cents/kWh = 1620 cents.

12 questions · Seed 42 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 16-18

Electrical energy (kWh) & cost

Take your time. Show your thinking.

1. An electrical appliance rated at 1 kW is switched on for 4 hours. If electricity costs 10 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1 kW × t = 4 h = 4 kWh · Tariff: 10¢/kWh → Cost = ?
2. An electrical appliance rated at 2 kW is switched on for 10 hours. If electricity costs 15 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2 kW × t = 10 h = 20 kWh · Tariff: 15¢/kWh → Cost = ?
3. An electrical appliance rated at 2.5 kW is switched on for 20 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2.5 kW × t = 20 h = 50 kWh · Tariff: 25¢/kWh → Cost = ?
4. An electrical appliance rated at 2 kW is switched on for 10 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2 kW × t = 10 h = 20 kWh · Tariff: 30¢/kWh → Cost = ?
5. An electrical appliance rated at 2.5 kW is switched on for 18 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2.5 kW × t = 18 h = 45 kWh · Tariff: 25¢/kWh → Cost = ?
6. An electrical appliance rated at 1.5 kW is switched on for 8 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1.5 kW × t = 8 h = 12 kWh · Tariff: 45¢/kWh → Cost = ?
7. An electrical appliance rated at 4 kW is switched on for 16 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 4 kW × t = 16 h = 64 kWh · Tariff: 45¢/kWh → Cost = ?
8. An electrical appliance rated at 1.5 kW is switched on for 12 hours. If electricity costs 20 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1.5 kW × t = 12 h = 18 kWh · Tariff: 20¢/kWh → Cost = ?
9. An electrical appliance rated at 2.5 kW is switched on for 22 hours. If electricity costs 35 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2.5 kW × t = 22 h = 55 kWh · Tariff: 35¢/kWh → Cost = ?
10. An electrical appliance rated at 2 kW is switched on for 16 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2 kW × t = 16 h = 32 kWh · Tariff: 45¢/kWh → Cost = ?
11. An electrical appliance rated at 2 kW is switched on for 8 hours. If electricity costs 10 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 2 kW × t = 8 h = 16 kWh · Tariff: 10¢/kWh → Cost = ?
12. An electrical appliance rated at 1.5 kW is switched on for 24 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
P = 1.5 kW × t = 24 h = 36 kWh · Tariff: 45¢/kWh → Cost = ?

12 questions · Seed 42 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 16-18

Electrical energy (kWh) & cost

Answers and reasoning. Review before teaching.

1. An electrical appliance rated at 1 kW is switched on for 4 hours. If electricity costs 10 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
40 cents
Electrical energy E = P × t = 1 kW × 4 h = 4 kWh. Total cost = 4 kWh × 10 cents/kWh = 40 cents.
2. An electrical appliance rated at 2 kW is switched on for 10 hours. If electricity costs 15 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
300 cents
Electrical energy E = P × t = 2 kW × 10 h = 20 kWh. Total cost = 20 kWh × 15 cents/kWh = 300 cents.
3. An electrical appliance rated at 2.5 kW is switched on for 20 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1250 cents
Electrical energy E = P × t = 2.5 kW × 20 h = 50 kWh. Total cost = 50 kWh × 25 cents/kWh = 1250 cents.
4. An electrical appliance rated at 2 kW is switched on for 10 hours. If electricity costs 30 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
600 cents
Electrical energy E = P × t = 2 kW × 10 h = 20 kWh. Total cost = 20 kWh × 30 cents/kWh = 600 cents.
5. An electrical appliance rated at 2.5 kW is switched on for 18 hours. If electricity costs 25 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1125 cents
Electrical energy E = P × t = 2.5 kW × 18 h = 45 kWh. Total cost = 45 kWh × 25 cents/kWh = 1125 cents.
6. An electrical appliance rated at 1.5 kW is switched on for 8 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
540 cents
Electrical energy E = P × t = 1.5 kW × 8 h = 12 kWh. Total cost = 12 kWh × 45 cents/kWh = 540 cents.
7. An electrical appliance rated at 4 kW is switched on for 16 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
2880 cents
Electrical energy E = P × t = 4 kW × 16 h = 64 kWh. Total cost = 64 kWh × 45 cents/kWh = 2880 cents.
8. An electrical appliance rated at 1.5 kW is switched on for 12 hours. If electricity costs 20 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
360 cents
Electrical energy E = P × t = 1.5 kW × 12 h = 18 kWh. Total cost = 18 kWh × 20 cents/kWh = 360 cents.
9. An electrical appliance rated at 2.5 kW is switched on for 22 hours. If electricity costs 35 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1925 cents
Electrical energy E = P × t = 2.5 kW × 22 h = 55 kWh. Total cost = 55 kWh × 35 cents/kWh = 1925 cents.
10. An electrical appliance rated at 2 kW is switched on for 16 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1440 cents
Electrical energy E = P × t = 2 kW × 16 h = 32 kWh. Total cost = 32 kWh × 45 cents/kWh = 1440 cents.
11. An electrical appliance rated at 2 kW is switched on for 8 hours. If electricity costs 10 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
160 cents
Electrical energy E = P × t = 2 kW × 8 h = 16 kWh. Total cost = 16 kWh × 10 cents/kWh = 160 cents.
12. An electrical appliance rated at 1.5 kW is switched on for 24 hours. If electricity costs 45 cents per kWh, calculate the total cost of the electrical energy transferred in cents.
1620 cents
Electrical energy E = P × t = 1.5 kW × 24 h = 36 kWh. Total cost = 36 kWh × 45 cents/kWh = 1620 cents.

12 questions · Seed 42 · Age guidance, not curriculum certification