Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 983 · 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.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
2. 2.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open
4. 4.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
5. 5.True or false: to use daylight to read saves electricity. (a) False (b) True
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
7. 7.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
8. 8.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
9. 9.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
10. 10.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
11. 11.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
13. 13.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
14. 14.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) switch off empty rooms (d) use LED lamps
15. 15.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
16. 16.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
18. 18.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
20. 20.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) leave fridge door open (d) leave the TV on standby
28. 28.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) leave fridge door open (d) unplug idle chargers
29. 29.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) unplug idle chargers (d) use daylight to read
31. 31.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) close the fridge quickly
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) run fans in empty rooms
35. 35.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.True or false: to switch off empty rooms saves electricity. (a) False (b) True
37. 37.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
38. 38.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
40. 40.True or false: to use LED lamps wastes electricity. (a) False (b) True

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