Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 166 · 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 of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) iron one shirt at a time
2. 2.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) use LED lamps (d) run fans in empty rooms
3. 3.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) leave fridge door open (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.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
7. 7.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
9. 9.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
10. 10.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
11. 11.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
12. 12.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use LED lamps (d) close the fridge quickly
14. 14.True or false: to leave the TV on standby saves electricity. (a) True (b) False
15. 15.🧾 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?
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) switch off empty rooms (d) iron one shirt at a time
17. 17.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) leave fridge door open
19. 19.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
20. 20.True or false: to use LED lamps saves electricity. (a) False (b) True
21. 21.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
23. 23.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) iron one shirt at a time
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 8 hours. How many watt-hours (Wh) are saved?
25. 25.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) switch off empty rooms (d) use LED lamps
26. 26.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) leave fridge door open (d) leave the TV on standby
27. 27.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
28. 28.True or false: to use LED lamps wastes electricity. (a) True (b) False
29. 29.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) switch off empty rooms (d) use LED lamps
31. 31.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) close the fridge quickly
33. 33.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
34. 34.True or false: to use old filament bulbs saves electricity. (a) True (b) False
35. 35.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.True or false: to use daylight to read wastes electricity. (a) False (b) True
38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
39. 39.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave the TV on standby (d) close the fridge quickly
40. 40.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) close the fridge quickly (d) switch off empty rooms

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