Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 175 · 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 close the fridge quickly wastes electricity. (a) True (b) False
2. 2.True or false: to use daylight to read saves electricity. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) switch off empty rooms
4. 4.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
5. 5.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
9. 9.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) iron one shirt at a time (d) use old filament bulbs
15. 15.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
17. 17.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
18. 18.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
20. 20.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
21. 21.🧾 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?
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) leave the TV on standby
23. 23.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
24. 24.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) use LED lamps
26. 26.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
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 3 hours. How many watt-hours (Wh) are saved?
30. 30.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
32. 32.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
33. 33.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 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?
35. 35.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) close the fridge quickly
36. 36.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) use old filament bulbs
37. 37.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) close the fridge quickly (d) iron one shirt at a time
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 8 hours. How many watt-hours (Wh) are saved?
39. 39.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
40. 40.True or false: to use LED lamps wastes electricity. (a) True (b) False

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