Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 741 · 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.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
4. 4.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
5. 5.True or false: to switch off empty rooms saves electricity. (a) True (b) False
6. 6.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
7. 7.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) leave the TV on standby
8. 8.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) unplug idle chargers (d) leave the TV on standby
9. 9.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
10. 10.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) use old filament bulbs
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
13. 13.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
15. 15.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
16. 16.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) iron one shirt at a time
18. 18.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
20. 20.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
22. 22.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
26. 26.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
27. 27.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
29. 29.True or false: to unplug idle chargers saves electricity. (a) False (b) True
30. 30.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) leave the TV on standby
31. 31.🧾 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
32. 32.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) unplug idle chargers (d) use daylight to read
33. 33.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use LED lamps (d) run fans in empty rooms
34. 34.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) set the AC to 24 °C
36. 36.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
37. 37.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) set the AC to 24 °C (d) switch off empty rooms
38. 38.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use daylight to read (d) switch off empty rooms
39. 39.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
40. 40.True or false: to use LED lamps wastes electricity. (a) True (b) False

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