Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 781 · 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 is the odd one out? (a) use LED lamps (b) use daylight to read (c) unplug idle chargers (d) leave the TV on standby
2. 2.🧾 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?
3. 3.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) run fans in empty rooms (d) use old filament bulbs
4. 4.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
5. 5.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
6. 6.🧾 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?
7. 7.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
9. 9.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) switch off empty rooms (d) run fans in empty rooms
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
12. 12.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) unplug idle chargers (d) switch off empty rooms
14. 14.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
16. 16.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
17. 17.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
19. 19.True or false: to use LED lamps wastes electricity. (a) False (b) True
20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
22. 22.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) unplug idle chargers
24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
25. 25.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) iron one shirt at a time (d) use old filament bulbs
28. 28.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
32. 32.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
34. 34.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) close the fridge quickly (d) set the AC to 24 °C
36. 36.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
37. 37.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
38. 38.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
39. 39.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to leave fridge door open wastes electricity. (a) False (b) True

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