Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 228 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
2. 2.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
4. 4.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) run fans in empty rooms (d) use LED lamps
5. 5.🧾 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?
6. 6.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) use daylight to read
8. 8.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) use old filament bulbs
9. 9.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) close the fridge quickly (d) switch off empty rooms
10. 10.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
12. 12.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
15. 15.True or false: to use LED lamps saves electricity. (a) False (b) True
16. 16.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
17. 17.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
18. 18.True or false: to use daylight to read wastes electricity. (a) True (b) False
19. 19.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
21. 21.True or false: to unplug idle chargers saves electricity. (a) False (b) True
22. 22.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) leave fridge door open (d) use daylight to read
24. 24.True or false: to close the fridge quickly saves electricity. (a) True (b) False
25. 25.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) leave the TV on standby
26. 26.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) set the AC to 24 °C (d) use old filament bulbs
28. 28.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
29. 29.True or false: to use LED lamps wastes electricity. (a) True (b) False
30. 30.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
31. 31.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) use daylight to read
33. 33.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) unplug idle chargers (d) iron one shirt at a time
34. 34.🔍 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
35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
36. 36.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
38. 38.True or false: to leave the TV on standby saves electricity. (a) True (b) False
39. 39.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) run fans in empty rooms (d) leave the TV on standby
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?

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