Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 522 · 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 unplug idle chargers? (a) saves electricity (b) wastes electricity
2. 2.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
3. 3.True or false: to use LED lamps wastes electricity. (a) False (b) True
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
5. 5.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
7. 7.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
9. 9.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave the TV on standby (d) use LED lamps
10. 10.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
11. 11.True or false: to unplug idle chargers saves electricity. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) use LED lamps (d) unplug idle chargers
13. 13.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) close the fridge quickly (d) leave fridge door open
14. 14.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
15. 15.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
17. 17.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
19. 19.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
21. 21.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
22. 22.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
25. 25.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) use LED lamps (d) set the AC to 24 °C
27. 27.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave the TV on standby
28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
29. 29.True or false: to use daylight to read wastes electricity. (a) False (b) True
30. 30.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) switch off empty rooms (d) run fans in empty rooms
31. 31.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) iron one shirt at a time
35. 35.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 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?
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) iron one shirt at a time
38. 38.🧾 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?
39. 39.🧾 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?
40. 40.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False

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