Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 418 · 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 unplug idle chargers wastes electricity. (a) True (b) False
2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) iron one shirt at a time
4. 4.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
5. 5.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) use LED lamps
6. 6.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
7. 7.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) set the AC to 24 °C (d) close the fridge quickly
8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use daylight to read (d) run fans in empty rooms
9. 9.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
10. 10.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
11. 11.True or false: to leave fridge door open saves electricity. (a) False (b) True
12. 12.🧾 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?
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) set the AC to 24 °C (d) switch off empty rooms
14. 14.True or false: to use LED lamps wastes electricity. (a) True (b) False
15. 15.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) use old filament bulbs (d) run fans in empty rooms
16. 16.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) use daylight to read
18. 18.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) iron one shirt at a time
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
20. 20.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
21. 21.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
22. 22.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
23. 23.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) use LED lamps (d) leave the TV on standby
24. 24.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
27. 27.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) switch off empty rooms (d) set the AC to 24 °C
28. 28.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
29. 29.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
30. 30.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
31. 31.True or false: to use LED lamps saves electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) close the fridge quickly
33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
34. 34.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
36. 36.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
37. 37.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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