Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 976 · 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.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave the TV on standby (d) use LED lamps
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms
3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) iron one shirt at a time (d) switch off empty rooms
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) set the AC to 24 °C (d) use LED lamps
6. 6.🧾 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?
7. 7.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) unplug idle chargers
8. 8.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
9. 9.True or false: to use daylight to read wastes electricity. (a) False (b) True
10. 10.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
11. 11.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) use LED lamps (d) iron one shirt at a time
12. 12.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) use old filament bulbs (d) switch off empty rooms
13. 13.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
15. 15.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
16. 16.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
17. 17.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use old filament bulbs (d) use LED lamps
19. 19.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
21. 21.True or false: to leave the TV on standby saves electricity. (a) False (b) True
22. 22.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
23. 23.🧾 A 500 W appliance runs for 6 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 2 hours. How many watt-hours (Wh) are saved?
25. 25.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
26. 26.True or false: to use old filament bulbs saves electricity. (a) True (b) False
27. 27.True or false: to use LED lamps wastes electricity. (a) False (b) True
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) switch off empty rooms
30. 30.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
33. 33.True or false: to close the fridge quickly saves electricity. (a) True (b) False
34. 34.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
39. 39.True or false: to use daylight to read saves electricity. (a) True (b) False
40. 40.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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