Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 270 · 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 leave fridge door open saves electricity. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) use daylight to read (d) set the AC to 24 °C
3. 3.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
4. 4.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) use daylight to read
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
7. 7.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) run fans in empty rooms (d) iron one shirt at a time
9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
10. 10.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
11. 11.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
13. 13.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
14. 14.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
15. 15.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
17. 17.True or false: to close the fridge quickly saves electricity. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) use daylight to read (d) close the fridge quickly
19. 19.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) set the AC to 24 °C (d) leave the TV on standby
20. 20.🧾 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?
21. 21.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
22. 22.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
23. 23.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.True or false: to leave fridge door open wastes electricity. (a) False (b) True
25. 25.True or false: to use old filament bulbs saves electricity. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use LED lamps (d) close the fridge quickly
27. 27.True or false: to unplug idle chargers saves electricity. (a) True (b) False
28. 28.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) leave fridge door open (d) run fans in empty rooms
29. 29.True or false: to switch off empty rooms saves electricity. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) close the fridge quickly (d) use daylight to read
31. 31.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
32. 32.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
33. 33.🧾 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
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
35. 35.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) unplug idle chargers (d) use daylight to read
36. 36.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
37. 37.🧾 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?
38. 38.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) switch off empty rooms (d) use LED lamps
39. 39.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
40. 40.True or false: to run fans in empty rooms saves electricity. (a) True (b) False

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