Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 169 · 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 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
2. 2.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
3. 3.True or false: to switch off empty rooms saves electricity. (a) True (b) False
4. 4.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
7. 7.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) leave fridge door open
8. 8.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) unplug idle chargers
9. 9.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
10. 10.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) use daylight to read
11. 11.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.🧾 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
13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) leave fridge door open
14. 14.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
15. 15.🧾 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?
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
18. 18.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
19. 19.True or false: to use LED lamps wastes electricity. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) set the AC to 24 °C (d) use LED lamps
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
22. 22.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) switch off empty rooms (d) iron one shirt at a time
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
24. 24.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
25. 25.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) leave the TV on standby
28. 28.True or false: to leave fridge door open saves electricity. (a) True (b) False
29. 29.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) run fans in empty rooms
31. 31.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
33. 33.True or false: to use daylight to read wastes electricity. (a) True (b) False
34. 34.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
35. 35.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
36. 36.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
37. 37.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
38. 38.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
40. 40.🔍 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) use daylight to read

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