Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 942 · 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) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
2. 2.True or false: to leave fridge door open wastes electricity. (a) False (b) True
3. 3.🧾 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?
4. 4.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these wastes electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) use daylight to read
6. 6.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) leave the TV on standby (d) set the AC to 24 °C
8. 8.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) iron one shirt at a time
11. 11.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
12. 12.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) use daylight to read
13. 13.True or false: to leave fridge door open saves electricity. (a) True (b) False
14. 14.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
15. 15.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
16. 16.True or false: to use daylight to read wastes electricity. (a) True (b) False
17. 17.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
18. 18.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) leave fridge door open (d) close the fridge quickly
19. 19.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
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 6 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 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?
23. 23.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) switch off empty rooms (d) leave the TV on standby
24. 24.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
25. 25.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
26. 26.True or false: to leave the TV on standby saves electricity. (a) False (b) True
27. 27.True or false: to switch off empty rooms saves electricity. (a) True (b) False
28. 28.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
29. 29.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) use LED lamps (d) use daylight to read
30. 30.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
31. 31.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
32. 32.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) run fans in empty rooms
33. 33.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
35. 35.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
36. 36.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
38. 38.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) switch off empty rooms
39. 39.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity

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