Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 861 · 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 saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
2. 2.🧾 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?
3. 3.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
4. 4.True or false: to leave fridge door open saves electricity. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) set the AC to 24 °C (d) use LED lamps
6. 6.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
7. 7.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
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 1 hour. How many watt-hours (Wh) are saved?
9. 9.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
10. 10.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) leave fridge door open
11. 11.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave fridge door open (d) close the fridge quickly
12. 12.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to switch off empty rooms saves electricity. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) set the AC to 24 °C
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) set the AC to 24 °C
16. 16.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
18. 18.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
19. 19.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
21. 21.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) switch off empty rooms (d) unplug idle chargers
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 fridge door open
23. 23.True or false: to unplug idle chargers saves electricity. (a) False (b) True
24. 24.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
25. 25.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
26. 26.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
29. 29.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
31. 31.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
33. 33.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use LED lamps
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 8 hours. How many watt-hours (Wh) are saved?
35. 35.True or false: to use daylight to read wastes electricity. (a) False (b) True
36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
37. 37.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) use old filament bulbs (d) switch off empty rooms
39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
40. 40.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity

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