Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 846 · 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 oil lamp (d) an LED lamp
2. 2.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
3. 3.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
5. 5.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
7. 7.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) switch off empty rooms (d) use daylight to read
8. 8.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
9. 9.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
11. 11.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
12. 12.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) leave the TV on standby
13. 13.🧾 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?
14. 14.🧾 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?
15. 15.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) switch off empty rooms (d) unplug idle chargers
17. 17.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
19. 19.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
20. 20.True or false: to leave the TV on standby saves electricity. (a) False (b) True
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use daylight to read
22. 22.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
25. 25.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) iron one shirt at a time (d) switch off empty rooms
26. 26.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to close the fridge quickly saves electricity. (a) True (b) False
28. 28.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
29. 29.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
30. 30.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
32. 32.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
35. 35.True or false: to use LED lamps saves electricity. (a) True (b) False
36. 36.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave the TV on standby
37. 37.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
39. 39.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
40. 40.True or false: to use old filament bulbs wastes electricity. (a) False (b) True

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