Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 628 · 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 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
3. 3.True or false: to use daylight to read saves electricity. (a) False (b) True
4. 4.🧾 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
5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
6. 6.🧾 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?
7. 7.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) switch off empty rooms (d) iron one shirt at a time
8. 8.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
9. 9.True or false: to use LED lamps wastes electricity. (a) False (b) True
10. 10.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
11. 11.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
15. 15.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
16. 16.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
17. 17.Which of these wastes electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) close the fridge quickly (d) set the AC to 24 °C
18. 18.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) run fans in empty rooms (d) iron one shirt at a time
21. 21.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) use old filament bulbs
22. 22.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
23. 23.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) leave fridge door open
24. 24.True or false: to switch off empty rooms saves electricity. (a) False (b) True
25. 25.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
26. 26.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) set the AC to 24 °C (d) close the fridge quickly
28. 28.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
29. 29.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) close the fridge quickly (d) set the AC to 24 °C
30. 30.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
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 4 hours. How many watt-hours (Wh) are saved?
33. 33.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
34. 34.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
35. 35.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) close the fridge quickly (d) set the AC to 24 °C
36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
39. 39.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) leave fridge door open (d) run fans in empty rooms
40. 40.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) leave fridge door open (d) leave the TV on standby

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