Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 611 · 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.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
3. 3.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) set the AC to 24 °C (d) unplug idle chargers
4. 4.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
5. 5.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
7. 7.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) use daylight to read (d) use LED lamps
9. 9.🧾 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?
10. 10.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
11. 11.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
13. 13.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
14. 14.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) use LED lamps (d) switch off empty rooms
15. 15.True or false: to switch off empty rooms saves electricity. (a) False (b) True
16. 16.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
17. 17.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read
18. 18.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) use daylight to read (d) close the fridge quickly
19. 19.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
22. 22.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
23. 23.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 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?
25. 25.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave fridge door open
28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
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 10 hours. How many watt-hours (Wh) are saved?
30. 30.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) leave fridge door open
31. 31.True or false: to use LED lamps wastes electricity. (a) True (b) False
32. 32.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) use LED lamps (d) unplug idle chargers
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.True or false: to leave fridge door open saves electricity. (a) False (b) True
37. 37.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
38. 38.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?

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