Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 501 · 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 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) set the AC to 24 °C (d) switch off empty rooms
4. 4.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
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 3 hours. How many watt-hours (Wh) are saved?
6. 6.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) use LED lamps
7. 7.True or false: to leave fridge door open wastes electricity. (a) False (b) True
8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) run fans in empty rooms (d) use LED lamps
9. 9.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
10. 10.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) set the AC to 24 °C
11. 11.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
13. 13.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
14. 14.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
15. 15.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) use old filament bulbs (d) run fans in empty rooms
17. 17.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) use LED lamps
18. 18.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
20. 20.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
21. 21.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) switch off empty rooms (d) use old filament bulbs
23. 23.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) close the fridge quickly (d) switch off empty rooms
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
25. 25.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
26. 26.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) switch off empty rooms (d) iron one shirt at a time
28. 28.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) use LED lamps (d) close the fridge quickly
29. 29.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) switch off empty rooms (d) unplug idle chargers
31. 31.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
32. 32.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to close the fridge quickly saves electricity. (a) False (b) True
38. 38.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
40. 40.True or false: to use daylight to read wastes electricity. (a) True (b) False

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