Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 961 · 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.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
2. 2.True or false: to leave fridge door open wastes electricity. (a) False (b) True
3. 3.Which of these wastes electricity? (a) run fans in empty rooms (b) use daylight to read (c) switch off empty rooms (d) set the AC to 24 °C
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) iron one shirt at a time
5. 5.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
6. 6.🧾 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?
7. 7.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.True or false: to unplug idle chargers saves electricity. (a) True (b) False
9. 9.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
11. 11.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
13. 13.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) set the AC to 24 °C (d) use daylight to read
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 6 hours. How many watt-hours (Wh) are saved?
15. 15.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
17. 17.🧾 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?
18. 18.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
20. 20.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) unplug idle chargers (d) use old filament bulbs
21. 21.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) close the fridge quickly (d) switch off empty rooms
22. 22.Which of these wastes electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) switch off empty rooms (d) set the AC to 24 °C
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
24. 24.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) switch off empty rooms (d) use old filament bulbs
25. 25.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
27. 27.🧾 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?
28. 28.Which of these saves electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) leave the TV on standby (d) leave fridge door open
29. 29.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
32. 32.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
33. 33.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
34. 34.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) leave fridge door open
35. 35.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to leave the TV on standby saves electricity. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) switch off empty rooms (d) set the AC to 24 °C
38. 38.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) run fans in empty rooms (d) use LED lamps

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