Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 962 · 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.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) close the fridge quickly (d) unplug idle chargers
3. 3.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) switch off empty rooms (d) iron one shirt at a time
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
6. 6.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
7. 7.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
8. 8.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
9. 9.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
10. 10.True or false: to use daylight to read wastes electricity. (a) False (b) True
11. 11.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) use daylight to read
12. 12.True or false: to use old filament bulbs saves electricity. (a) True (b) False
13. 13.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
14. 14.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
15. 15.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
17. 17.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
19. 19.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
21. 21.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
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 4 hours. How many watt-hours (Wh) are saved?
23. 23.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
24. 24.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
25. 25.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
26. 26.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) close the fridge quickly
28. 28.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
32. 32.🧾 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?
33. 33.True or false: to leave fridge door open wastes electricity. (a) True (b) False
34. 34.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
35. 35.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
37. 37.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
38. 38.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) unplug idle chargers
39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
40. 40.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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