Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 612 · 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.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) run fans in empty rooms (d) unplug idle chargers
3. 3.🧾 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?
4. 4.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
5. 5.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
6. 6.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
7. 7.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) use old filament bulbs (d) unplug idle chargers
8. 8.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) set the AC to 24 °C
9. 9.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) switch off empty rooms (d) use old filament bulbs
11. 11.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
12. 12.🧾 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?
13. 13.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
14. 14.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) use LED lamps
15. 15.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) leave fridge door open
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) use daylight to read
17. 17.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 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?
19. 19.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
21. 21.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
22. 22.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
23. 23.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
24. 24.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
25. 25.🧾 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?
26. 26.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
27. 27.True or false: to use LED lamps saves electricity. (a) False (b) True
28. 28.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
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.🧾 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?
31. 31.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
33. 33.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) leave fridge door open (d) close the fridge quickly
35. 35.True or false: to leave fridge door open saves electricity. (a) True (b) False
36. 36.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 250 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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