Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 728 · 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 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
2. 2.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
3. 3.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
4. 4.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
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 5 hours. How many watt-hours (Wh) are saved?
6. 6.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) leave fridge door open
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use LED lamps (d) close the fridge quickly
8. 8.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
9. 9.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
11. 11.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) unplug idle chargers
12. 12.🧾 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?
13. 13.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) run fans in empty rooms
14. 14.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
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 9 hours. How many watt-hours (Wh) are saved?
16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
17. 17.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
18. 18.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) close the fridge quickly (d) use daylight to read
19. 19.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) iron one shirt at a time
20. 20.True or false: to switch off empty rooms saves electricity. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
22. 22.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers
23. 23.True or false: to use daylight to read wastes electricity. (a) True (b) False
24. 24.True or false: to use daylight to read saves electricity. (a) False (b) True
25. 25.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
26. 26.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) leave fridge door open (d) use LED lamps
27. 27.🧾 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?
28. 28.Which of these wastes electricity? (a) run fans in empty rooms (b) use daylight to read (c) close the fridge quickly (d) switch off empty rooms
29. 29.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) unplug idle chargers (d) use daylight to read
30. 30.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) use daylight to read
31. 31.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
33. 33.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
34. 34.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
37. 37.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
39. 39.True or false: to use LED lamps saves electricity. (a) True (b) False
40. 40.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity

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