Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 535 · 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 filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
2. 2.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) switch off empty rooms (d) run fans in empty rooms
4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave the TV on standby
6. 6.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
8. 8.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
9. 9.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.🧾 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?
11. 11.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) use daylight to read (d) unplug idle chargers
12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
13. 13.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) close the fridge quickly (d) set the AC to 24 °C
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
16. 16.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
17. 17.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave fridge door open (d) leave the TV on standby
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) iron one shirt at a time
19. 19.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) switch off empty rooms (d) leave the TV on standby
21. 21.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 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.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) run fans in empty rooms (d) switch off empty rooms
25. 25.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
26. 26.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to use LED lamps wastes electricity. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
29. 29.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
30. 30.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) leave the TV on standby (d) run fans in empty rooms
32. 32.🧾 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?
33. 33.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.🧾 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?
36. 36.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to close the fridge quickly saves electricity. (a) False (b) True
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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