Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 594 · 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 is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) run fans in empty rooms (d) set the AC to 24 °C
2. 2.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
3. 3.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
4. 4.True or false: to use LED lamps wastes electricity. (a) False (b) True
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
8. 8.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
9. 9.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
10. 10.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) switch off empty rooms (d) use daylight to read
12. 12.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) iron one shirt at a time (d) use daylight to read
14. 14.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) use LED lamps (d) switch off empty rooms
15. 15.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to leave the TV on standby saves electricity. (a) True (b) False
17. 17.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
18. 18.🧾 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
19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
20. 20.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
21. 21.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
23. 23.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) switch off empty rooms (d) unplug idle chargers
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 10 hours. How many watt-hours (Wh) are saved?
25. 25.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) set the AC to 24 °C (d) use daylight to read
26. 26.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) set the AC to 24 °C (d) leave the TV on standby
28. 28.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
29. 29.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
31. 31.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
32. 32.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
33. 33.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
34. 34.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers
35. 35.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
36. 36.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) run fans in empty rooms (d) leave the TV on standby
39. 39.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
40. 40.🧾 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?

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