Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 338 · 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 use daylight to read saves electricity. (a) False (b) True
2. 2.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
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 3 hours. How many watt-hours (Wh) are saved?
5. 5.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
6. 6.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
7. 7.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) switch off empty rooms (d) leave the TV on standby
8. 8.🧾 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?
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
10. 10.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.True or false: to leave fridge door open saves electricity. (a) False (b) True
13. 13.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
15. 15.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
19. 19.True or false: to switch off empty rooms saves electricity. (a) False (b) True
20. 20.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) leave fridge door open
22. 22.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) unplug idle chargers (d) set the AC to 24 °C
23. 23.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
26. 26.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
28. 28.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
29. 29.🧾 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?
30. 30.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) use LED lamps
33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 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?
37. 37.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
40. 40.True or false: to use daylight to read wastes electricity. (a) False (b) True

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