Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 585 · 40 questions

Remember (Watts × hours ÷ 1000): Units (kWh) = watts × hours ÷ 1000. Bill = units × price per unit (e.g. 150 units × ₹6 = ₹900). Save: switch off, LED lamps, daylight, no standby, close the fridge quickly.

1. 1.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
3. 3.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) leave fridge door open (d) use old filament bulbs
4. 4.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
5. 5.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
6. 6.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
7. 7.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
9. 9.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
11. 11.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
12. 12.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
14. 14.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) use daylight to read
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
16. 16.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
17. 17.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use old filament bulbs (d) iron one shirt at a time
19. 19.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) iron one shirt at a time (d) set the AC to 24 °C
20. 20.True or false: to leave the TV on standby saves electricity. (a) True (b) False
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
22. 22.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
23. 23.True or false: to unplug idle chargers saves electricity. (a) False (b) True
24. 24.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) set the AC to 24 °C
25. 25.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to switch off empty rooms saves electricity. (a) True (b) False
28. 28.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) unplug idle chargers (d) use old filament bulbs
29. 29.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
30. 30.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to use LED lamps wastes electricity. (a) False (b) True
33. 33.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.True or false: to leave fridge door open wastes electricity. (a) True (b) False
36. 36.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
38. 38.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
39. 39.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) run fans in empty rooms (d) set the AC to 24 °C
40. 40.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids