Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 363 · 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.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) set the AC to 24 °C (d) use daylight to read
2. 2.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
3. 3.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
4. 4.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
5. 5.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) switch off empty rooms (d) use daylight to read
7. 7.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
11. 11.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) use LED lamps
12. 12.True or false: to switch off empty rooms saves electricity. (a) False (b) True
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
14. 14.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
15. 15.True or false: to leave fridge door open wastes electricity. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) close the fridge quickly (d) leave the TV on standby
17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) set the AC to 24 °C
18. 18.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
19. 19.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) close the fridge quickly
20. 20.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) close the fridge quickly
23. 23.True or false: to close the fridge quickly saves electricity. (a) False (b) True
24. 24.True or false: to leave the TV on standby saves electricity. (a) False (b) True
25. 25.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) iron one shirt at a time
26. 26.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
27. 27.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) switch off empty rooms (d) use LED lamps
31. 31.True or false: to use old filament bulbs saves electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
33. 33.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
34. 34.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use LED lamps (d) leave fridge door open
35. 35.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 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?
37. 37.True or false: to use daylight to read wastes electricity. (a) True (b) False
38. 38.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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