Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 520 · 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 saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) iron one shirt at a time (d) run fans in empty rooms
2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
3. 3.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
4. 4.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) use LED lamps (d) use daylight to read
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
6. 6.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
7. 7.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use daylight to read (d) switch off empty rooms
8. 8.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
9. 9.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
10. 10.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 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
12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) iron one shirt at a time
14. 14.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
15. 15.True or false: to leave the TV on standby saves electricity. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
17. 17.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
18. 18.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) close the fridge quickly
19. 19.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) use daylight to read
20. 20.True or false: to close the fridge quickly saves electricity. (a) False (b) True
21. 21.True or false: to switch off empty rooms saves electricity. (a) True (b) False
22. 22.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
23. 23.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) set the AC to 24 °C
24. 24.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) switch off empty rooms (d) use LED lamps
25. 25.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
26. 26.True or false: to leave fridge door open saves electricity. (a) True (b) False
27. 27.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 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?
29. 29.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
32. 32.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
33. 33.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
34. 34.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A 100 W appliance runs for 10 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 2 hours. How many watt-hours (Wh) are saved?
37. 37.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
38. 38.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) switch off empty rooms (d) set the AC to 24 °C
40. 40.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) use LED lamps (d) leave fridge door open

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