Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 295 · 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.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
2. 2.🧾 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
3. 3.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
4. 4.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
6. 6.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) set the AC to 24 °C (d) use LED lamps
7. 7.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
10. 10.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
11. 11.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) use LED lamps
12. 12.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) set the AC to 24 °C
13. 13.🧾 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?
14. 14.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
15. 15.True or false: to use LED lamps wastes electricity. (a) True (b) False
16. 16.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
17. 17.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
19. 19.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
20. 20.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
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 6 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
25. 25.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
26. 26.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use daylight to read (d) leave the TV on standby
27. 27.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
29. 29.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) use daylight to read (d) use LED lamps
30. 30.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) unplug idle chargers (d) use daylight to read
32. 32.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
34. 34.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) use daylight to read
35. 35.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
37. 37.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
38. 38.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
40. 40.True or false: to close the fridge quickly saves electricity. (a) True (b) False

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