Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 674 · 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 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) run fans in empty rooms (d) use LED lamps
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
4. 4.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
5. 5.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
6. 6.True or false: to use daylight to read wastes electricity. (a) False (b) True
7. 7.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
8. 8.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) close the fridge quickly (d) use LED lamps
10. 10.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
11. 11.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
14. 14.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
15. 15.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) set the AC to 24 °C (d) unplug idle chargers
17. 17.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
19. 19.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) iron one shirt at a time
20. 20.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
21. 21.True or false: to use LED lamps saves electricity. (a) False (b) True
22. 22.True or false: to unplug idle chargers saves electricity. (a) True (b) False
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
24. 24.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.True or false: to use daylight to read saves electricity. (a) False (b) True
27. 27.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) unplug idle chargers (d) use old filament bulbs
28. 28.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to switch off empty rooms saves electricity. (a) True (b) False
30. 30.🧾 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?
31. 31.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) leave the TV on standby
32. 32.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
34. 34.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) leave fridge door open (d) set the AC to 24 °C
36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) unplug idle chargers (d) iron one shirt at a time
37. 37.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use daylight to read (d) close the fridge quickly
38. 38.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
39. 39.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) use LED lamps
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?

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