Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 472 · 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) iron one shirt at a time (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
2. 2.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
3. 3.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
4. 4.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
5. 5.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
7. 7.🧾 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?
8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) leave fridge door open (d) run fans in empty rooms
9. 9.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) unplug idle chargers
10. 10.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
11. 11.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
12. 12.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) use daylight to read
13. 13.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) iron one shirt at a time (d) use daylight to read
14. 14.True or false: to leave fridge door open wastes electricity. (a) False (b) True
15. 15.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to use old filament bulbs saves electricity. (a) True (b) False
17. 17.True or false: to leave the TV on standby saves electricity. (a) True (b) False
18. 18.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) switch off empty rooms (d) close the fridge quickly
19. 19.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
21. 21.🧾 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?
22. 22.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
23. 23.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to unplug idle chargers saves electricity. (a) True (b) False
25. 25.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
26. 26.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
27. 27.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) use old filament bulbs (d) run fans in empty rooms
28. 28.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
30. 30.🧾 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?
31. 31.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) set the AC to 24 °C
32. 32.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.True or false: to close the fridge quickly saves electricity. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
35. 35.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
38. 38.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
39. 39.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
40. 40.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False

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