Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 217 · 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 unplug idle chargers wastes electricity. (a) False (b) True
2. 2.True or false: to use LED lamps wastes electricity. (a) False (b) True
3. 3.True or false: to switch off empty rooms saves electricity. (a) False (b) True
4. 4.True or false: to leave fridge door open saves electricity. (a) False (b) True
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
6. 6.🧾 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?
7. 7.🧾 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?
8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
9. 9.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
12. 12.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) use LED lamps
13. 13.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
14. 14.True or false: to use old filament bulbs saves electricity. (a) True (b) False
15. 15.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
16. 16.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
17. 17.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
18. 18.🧾 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?
19. 19.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
21. 21.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) close the fridge quickly
24. 24.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
26. 26.True or false: to use LED lamps saves electricity. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) close the fridge quickly (d) switch off empty rooms
28. 28.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
29. 29.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
30. 30.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use LED lamps (d) switch off empty rooms
31. 31.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) unplug idle chargers (d) leave fridge door open
32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
33. 33.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
35. 35.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) leave the TV on standby (d) use daylight to read
36. 36.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
37. 37.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to leave the TV on standby saves electricity. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) use old filament bulbs (d) unplug idle chargers
40. 40.True or false: to use daylight to read wastes electricity. (a) True (b) False

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