Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 409 · 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 of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) unplug idle chargers (d) use LED lamps
2. 2.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 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
4. 4.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
5. 5.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
6. 6.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) run fans in empty rooms (d) set the AC to 24 °C
7. 7.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) run fans in empty rooms
8. 8.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
9. 9.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) use old filament bulbs (d) use LED lamps
11. 11.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
12. 12.True or false: to switch off empty rooms saves electricity. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) iron one shirt at a time (d) close the fridge quickly
14. 14.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
15. 15.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
16. 16.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
19. 19.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave the TV on standby (d) unplug idle chargers
20. 20.True or false: to use old filament bulbs saves electricity. (a) True (b) False
21. 21.True or false: to use LED lamps wastes electricity. (a) True (b) False
22. 22.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) use old filament bulbs (d) close the fridge quickly
23. 23.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) iron one shirt at a time (d) leave fridge door open
25. 25.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
27. 27.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
28. 28.True or false: to use LED lamps saves electricity. (a) True (b) False
29. 29.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) iron one shirt at a time
30. 30.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
31. 31.True or false: to leave fridge door open wastes electricity. (a) False (b) True
32. 32.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
33. 33.🧾 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?
34. 34.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
35. 35.🧾 A family uses 70 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 use old filament bulbs? (a) wastes electricity (b) saves electricity
37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
39. 39.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) switch off empty rooms (d) leave the TV on standby
40. 40.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby

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