Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 748 · 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 switch off empty rooms wastes electricity. (a) True (b) False
2. 2.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
3. 3.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
4. 4.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
7. 7.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
8. 8.True or false: to use LED lamps saves electricity. (a) False (b) True
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) run fans in empty rooms (d) leave fridge door open
10. 10.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
11. 11.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
12. 12.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
13. 13.🧾 A 40 W filament bulb is swapped for a 6 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 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
15. 15.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) run fans in empty rooms
17. 17.🧾 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?
18. 18.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) iron one shirt at a time (d) switch off empty rooms
20. 20.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) use LED lamps (d) close the fridge quickly
21. 21.🧾 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?
22. 22.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
24. 24.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
25. 25.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
26. 26.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these wastes electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) use daylight to read (d) switch off empty rooms
28. 28.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
30. 30.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use old filament bulbs (d) leave the TV on standby
31. 31.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
34. 34.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
35. 35.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
36. 36.True or false: to close the fridge quickly saves electricity. (a) False (b) True
37. 37.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) leave fridge door open (d) use LED lamps
38. 38.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.True or false: to use daylight to read wastes electricity. (a) False (b) True
40. 40.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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