Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 654 · 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.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
3. 3.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) leave the TV on standby (d) close the fridge quickly
4. 4.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
5. 5.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms
6. 6.🧾 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
7. 7.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
8. 8.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
9. 9.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
11. 11.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
13. 13.🧾 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?
14. 14.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) leave fridge door open
16. 16.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
17. 17.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
18. 18.🧾 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?
19. 19.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
20. 20.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) iron one shirt at a time (d) leave the TV on standby
21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
22. 22.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) leave fridge door open
23. 23.True or false: to leave fridge door open wastes electricity. (a) False (b) True
24. 24.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) close the fridge quickly (d) run fans in empty rooms
27. 27.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
28. 28.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
29. 29.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
30. 30.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
31. 31.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
32. 32.🧾 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?
33. 33.True or false: to leave fridge door open saves electricity. (a) True (b) False
34. 34.True or false: to use LED lamps saves electricity. (a) True (b) False
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
36. 36.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) iron one shirt at a time (d) switch off empty rooms
37. 37.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.🧾 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?
39. 39.True or false: to use LED lamps wastes electricity. (a) False (b) True
40. 40.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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