Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 177 · 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) a candle (c) an oil lamp (d) an LED lamp
2. 2.True or false: to leave the TV on standby saves electricity. (a) True (b) False
3. 3.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
5. 5.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
6. 6.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
7. 7.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) set the AC to 24 °C (d) run fans in empty rooms
8. 8.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
9. 9.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) iron one shirt at a time (d) leave the TV on standby
10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) switch off empty rooms (d) use LED lamps
11. 11.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
12. 12.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
13. 13.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
15. 15.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
17. 17.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) use old filament bulbs (d) use LED lamps
18. 18.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
21. 21.True or false: to use LED lamps wastes electricity. (a) True (b) False
22. 22.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
24. 24.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
25. 25.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
28. 28.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
29. 29.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
30. 30.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) close the fridge quickly (d) set the AC to 24 °C
32. 32.True or false: to use LED lamps saves electricity. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) close the fridge quickly (d) switch off empty rooms
34. 34.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.True or false: to close the fridge quickly saves electricity. (a) False (b) True
36. 36.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use daylight to read (d) leave the TV on standby
37. 37.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
39. 39.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity

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