Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 394 · 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.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
2. 2.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) switch off empty rooms
3. 3.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) switch off empty rooms (d) close the fridge quickly
4. 4.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
5. 5.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) close the fridge quickly (d) use old filament bulbs
6. 6.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) unplug idle chargers (d) leave the TV on standby
7. 7.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
9. 9.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
11. 11.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
12. 12.True or false: to use LED lamps wastes electricity. (a) False (b) True
13. 13.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) close the fridge quickly (d) leave the TV on standby
14. 14.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use LED lamps (d) use old filament bulbs
15. 15.True or false: to use daylight to read saves electricity. (a) True (b) False
16. 16.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
17. 17.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
18. 18.True or false: to close the fridge quickly saves electricity. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
20. 20.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
21. 21.True or false: to switch off empty rooms saves electricity. (a) True (b) False
22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
23. 23.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
25. 25.True or false: to leave fridge door open saves electricity. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) unplug idle chargers
27. 27.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
28. 28.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) run fans in empty rooms (d) unplug idle chargers
30. 30.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.True or false: to use LED lamps saves electricity. (a) False (b) True
32. 32.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
34. 34.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
36. 36.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
37. 37.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
40. 40.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity

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