Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 545 · 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) an oil lamp (c) a candle (d) an LED lamp
2. 2.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
3. 3.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
4. 4.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
6. 6.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) iron one shirt at a time (d) unplug idle chargers
7. 7.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.True or false: to use LED lamps wastes electricity. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
10. 10.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
11. 11.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
13. 13.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) set the AC to 24 °C (d) use old filament bulbs
14. 14.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
15. 15.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
16. 16.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
18. 18.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) close the fridge quickly (d) unplug idle chargers
20. 20.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) switch off empty rooms
21. 21.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) set the AC to 24 °C (d) run fans in empty rooms
23. 23.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
25. 25.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
27. 27.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) set the AC to 24 °C (d) use LED lamps
28. 28.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
29. 29.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
30. 30.True or false: to use LED lamps saves electricity. (a) True (b) False
31. 31.True or false: to use daylight to read saves electricity. (a) True (b) False
32. 32.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
35. 35.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
36. 36.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
39. 39.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
40. 40.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) set the AC to 24 °C (d) leave fridge door open

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