Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 808 · 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 family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
3. 3.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) close the fridge quickly (d) set the AC to 24 °C
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
7. 7.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
8. 8.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
10. 10.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
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 6 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) set the AC to 24 °C (d) use old filament bulbs
16. 16.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
17. 17.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) iron one shirt at a time
18. 18.True or false: to use LED lamps wastes electricity. (a) True (b) False
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
20. 20.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
21. 21.🧾 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?
22. 22.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) set the AC to 24 °C
24. 24.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
25. 25.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
26. 26.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
27. 27.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
29. 29.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
30. 30.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
31. 31.True or false: to unplug idle chargers saves electricity. (a) True (b) False
32. 32.True or false: to use old filament bulbs saves electricity. (a) True (b) False
33. 33.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) close the fridge quickly (d) use LED lamps
34. 34.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) close the fridge quickly (d) iron one shirt at a time
36. 36.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
37. 37.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) switch off empty rooms
38. 38.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
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 7 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 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?

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