Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 706 · 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.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
2. 2.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
3. 3.🧾 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?
4. 4.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) set the AC to 24 °C (d) use LED lamps
6. 6.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) use LED lamps (d) unplug idle chargers
8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) iron one shirt at a time (d) use old filament bulbs
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
11. 11.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) switch off empty rooms (d) use old filament bulbs
12. 12.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
13. 13.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
14. 14.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
17. 17.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) iron one shirt at a time
19. 19.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) iron one shirt at a time
22. 22.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
23. 23.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
24. 24.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
27. 27.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
31. 31.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C
32. 32.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
33. 33.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) switch off empty rooms
34. 34.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) switch off empty rooms (d) use daylight to read
35. 35.🧾 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?
36. 36.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use LED lamps
37. 37.🧾 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?
38. 38.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
39. 39.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) use LED lamps (d) set the AC to 24 °C
40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity

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