Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 518 · 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.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
2. 2.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
5. 5.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
7. 7.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
9. 9.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) close the fridge quickly (d) leave the TV on standby
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
12. 12.True or false: to use LED lamps saves electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
15. 15.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
17. 17.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
18. 18.True or false: to leave fridge door open saves electricity. (a) True (b) False
19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
20. 20.True or false: to use daylight to read wastes electricity. (a) False (b) True
21. 21.🧾 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?
22. 22.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
25. 25.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
26. 26.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
27. 27.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
28. 28.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
29. 29.🧾 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?
30. 30.True or false: to use LED lamps wastes electricity. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) leave fridge door open
32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) switch off empty rooms (d) use LED lamps
33. 33.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) leave the TV on standby (d) run fans in empty rooms
34. 34.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
35. 35.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) run fans in empty rooms (d) switch off empty rooms
36. 36.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) iron one shirt at a time (d) unplug idle chargers
37. 37.🧾 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?
38. 38.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
39. 39.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?

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