Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 650 · 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.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
2. 2.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) leave fridge door open (d) close the fridge quickly
3. 3.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) use LED lamps (d) switch off empty rooms
4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) unplug idle chargers (d) run fans in empty rooms
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
6. 6.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) use daylight to read
7. 7.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
8. 8.🧾 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?
9. 9.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) use LED lamps (d) leave the TV on standby
11. 11.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) use daylight to read
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) close the fridge quickly
13. 13.True or false: to use daylight to read wastes electricity. (a) True (b) False
14. 14.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
16. 16.🧾 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?
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) use old filament bulbs (d) switch off empty rooms
18. 18.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
19. 19.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
20. 20.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
21. 21.True or false: to use old filament bulbs saves electricity. (a) True (b) False
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
23. 23.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) close the fridge quickly
25. 25.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
26. 26.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
27. 27.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) use LED lamps (d) use daylight to read
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
29. 29.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
30. 30.🔍 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
31. 31.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) use LED lamps
32. 32.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
33. 33.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
34. 34.🧾 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
35. 35.True or false: to leave fridge door open wastes electricity. (a) True (b) False
36. 36.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
39. 39.True or false: to use LED lamps wastes electricity. (a) False (b) True
40. 40.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity

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