Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 733 · 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 set the AC to 24 °C wastes electricity. (a) True (b) False
2. 2.🧾 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?
3. 3.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) leave fridge door open
4. 4.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
5. 5.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) leave fridge door open (d) iron one shirt at a time
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
7. 7.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
8. 8.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) unplug idle chargers (d) run fans in empty rooms
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers
11. 11.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
12. 12.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) switch off empty rooms (d) unplug idle chargers
13. 13.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) use LED lamps (d) leave fridge door open
15. 15.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) iron one shirt at a time
17. 17.🧾 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
18. 18.🧾 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?
19. 19.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
22. 22.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
23. 23.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
24. 24.True or false: to use daylight to read wastes electricity. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) use daylight to read (d) set the AC to 24 °C
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 1 hour. How many watt-hours (Wh) are saved?
27. 27.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
28. 28.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) unplug idle chargers
31. 31.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
34. 34.True or false: to close the fridge quickly saves electricity. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) switch off empty rooms
36. 36.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
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 1 hour. How many watt-hours (Wh) are saved?
38. 38.🧾 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?
39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
40. 40.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) leave fridge door open (d) use daylight to read

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