Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 666 · 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 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?
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
3. 3.True or false: to unplug idle chargers saves electricity. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) switch off empty rooms (d) use LED lamps
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 unplug idle chargers? (a) saves electricity (b) wastes electricity
7. 7.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
8. 8.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
9. 9.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
10. 10.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use old filament bulbs (d) use LED lamps
11. 11.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) unplug idle chargers
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
14. 14.True or false: to leave the TV on standby saves electricity. (a) True (b) False
15. 15.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to use daylight to read saves electricity. (a) True (b) False
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use daylight to read (d) iron one shirt at a time
19. 19.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
20. 20.True or false: to switch off empty rooms saves electricity. (a) False (b) True
21. 21.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
22. 22.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
23. 23.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) leave fridge door open (d) use old filament bulbs
24. 24.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) switch off empty rooms (d) use old filament bulbs
25. 25.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) leave fridge door open
27. 27.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) set the AC to 24 °C
28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
29. 29.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
30. 30.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) run fans in empty rooms (d) iron one shirt at a time
31. 31.🧾 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?
32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
33. 33.True or false: to leave fridge door open saves electricity. (a) True (b) False
34. 34.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) set the AC to 24 °C (d) unplug idle chargers
35. 35.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
38. 38.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 75 W filament bulb is swapped for a 12 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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