Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 155 · 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 lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
2. 2.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) use daylight to read (d) use LED lamps
3. 3.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
4. 4.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
6. 6.True or false: to switch off empty rooms saves electricity. (a) False (b) True
7. 7.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
10. 10.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) close the fridge quickly (d) unplug idle chargers
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
12. 12.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
14. 14.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
16. 16.True or false: to use daylight to read saves electricity. (a) True (b) False
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
18. 18.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
19. 19.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) use LED lamps (d) use daylight to read
22. 22.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) use daylight to read
23. 23.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) use old filament bulbs (d) switch off empty rooms
24. 24.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
26. 26.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) unplug idle chargers (d) run fans in empty rooms
27. 27.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
28. 28.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) leave fridge door open
30. 30.True or false: to close the fridge quickly saves electricity. (a) False (b) True
31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
33. 33.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
34. 34.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) leave fridge door open (d) leave the TV on standby
35. 35.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
37. 37.True or false: to use old filament bulbs saves electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
39. 39.True or false: to leave fridge door open saves electricity. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use LED lamps (d) set the AC to 24 °C

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