Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 474 · 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 switch off empty rooms saves electricity. (a) False (b) True
2. 2.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
3. 3.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
4. 4.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) use LED lamps
5. 5.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
7. 7.🧾 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
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
9. 9.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
10. 10.True or false: to use daylight to read saves electricity. (a) True (b) False
11. 11.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) switch off empty rooms (d) leave the TV on standby
14. 14.🧾 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?
15. 15.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
16. 16.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) run fans in empty rooms
17. 17.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
18. 18.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) set the AC to 24 °C (d) use LED lamps
21. 21.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave the TV on standby (d) switch off empty rooms
25. 25.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
27. 27.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
28. 28.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use LED lamps (d) close the fridge quickly
30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) use old filament bulbs
31. 31.True or false: to use daylight to read wastes electricity. (a) False (b) True
32. 32.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
34. 34.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
35. 35.True or false: to unplug idle chargers saves electricity. (a) False (b) True
36. 36.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
37. 37.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
38. 38.🧾 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?
39. 39.True or false: to use LED lamps wastes electricity. (a) True (b) False
40. 40.True or false: to leave the TV on standby saves electricity. (a) True (b) False

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