Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 132 · 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 is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) leave fridge door open (d) set the AC to 24 °C
2. 2.🧾 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?
3. 3.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
4. 4.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) run fans in empty rooms
5. 5.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
6. 6.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
7. 7.True or false: to leave the TV on standby saves electricity. (a) True (b) False
8. 8.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
10. 10.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
11. 11.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
12. 12.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
13. 13.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
14. 14.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
15. 15.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.🧾 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?
17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
18. 18.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
19. 19.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) switch off empty rooms
20. 20.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
21. 21.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
22. 22.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
23. 23.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
26. 26.🧾 A 50 W appliance runs for 4 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) set the AC to 24 °C (d) leave the TV on standby
28. 28.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
30. 30.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) close the fridge quickly (d) run fans in empty rooms
31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
33. 33.Which of these wastes electricity? (a) run fans in empty rooms (b) use daylight to read (c) close the fridge quickly (d) use LED lamps
34. 34.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
35. 35.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 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?
38. 38.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
39. 39.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity

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