Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 626 · 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 candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
2. 2.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) unplug idle chargers (d) close the fridge quickly
3. 3.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.True or false: to leave fridge door open wastes electricity. (a) True (b) False
5. 5.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
6. 6.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) leave fridge door open (d) run fans in empty rooms
7. 7.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
8. 8.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
9. 9.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
11. 11.🧾 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?
12. 12.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
13. 13.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to leave fridge door open saves electricity. (a) True (b) False
15. 15.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
16. 16.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) set the AC to 24 °C
18. 18.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) use old filament bulbs
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
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 1 hour. How many watt-hours (Wh) are saved?
22. 22.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use LED lamps
23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
24. 24.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
25. 25.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
26. 26.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) set the AC to 24 °C (d) switch off empty rooms
29. 29.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
30. 30.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
31. 31.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
33. 33.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) switch off empty rooms (d) use daylight to read
35. 35.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
37. 37.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) close the fridge quickly
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity

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