Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 637 · 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) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) unplug idle chargers
2. 2.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
3. 3.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) run fans in empty rooms (d) use daylight to read
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
5. 5.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) use daylight to read (d) leave the TV on standby
6. 6.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
7. 7.🧾 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?
8. 8.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
9. 9.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
10. 10.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
11. 11.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) use daylight to read (d) set the AC to 24 °C
13. 13.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms
14. 14.True or false: to leave the TV on standby saves electricity. (a) True (b) False
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) use LED lamps
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) iron one shirt at a time
19. 19.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
21. 21.True or false: to use LED lamps wastes electricity. (a) False (b) True
22. 22.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) use LED lamps (d) switch off empty rooms
25. 25.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
26. 26.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
28. 28.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
29. 29.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
31. 31.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) close the fridge quickly (d) run fans in empty rooms
32. 32.True or false: to close the fridge quickly saves electricity. (a) False (b) True
33. 33.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
34. 34.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) leave the TV on standby (d) run fans in empty rooms
35. 35.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) leave fridge door open (d) use daylight to read
36. 36.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
37. 37.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
38. 38.True or false: to switch off empty rooms saves electricity. (a) False (b) True
39. 39.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity

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