Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 33 · 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 run fans in empty rooms? (a) saves electricity (b) wastes electricity
2. 2.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) use LED lamps (d) iron one shirt at a time
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
4. 4.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
5. 5.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
6. 6.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
7. 7.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.True or false: to close the fridge quickly saves electricity. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) close the fridge quickly (d) use daylight to read
10. 10.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) close the fridge quickly (d) run fans in empty rooms
11. 11.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) unplug idle chargers (d) use LED lamps
12. 12.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) switch off empty rooms
13. 13.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) use daylight to read
14. 14.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
16. 16.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
17. 17.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
18. 18.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) use daylight to read (d) set the AC to 24 °C
19. 19.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
20. 20.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
22. 22.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
23. 23.True or false: to use daylight to read wastes electricity. (a) True (b) False
24. 24.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
25. 25.True or false: to use LED lamps saves electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
27. 27.True or false: to leave fridge door open saves electricity. (a) False (b) True
28. 28.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
29. 29.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
30. 30.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
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.True or false: to switch off empty rooms saves electricity. (a) False (b) True
33. 33.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) use LED lamps (d) close the fridge quickly
35. 35.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) use old filament bulbs (d) leave the TV on standby
36. 36.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) use daylight to read (d) leave the TV on standby
38. 38.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) iron one shirt at a time
40. 40.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) switch off empty rooms (d) close the fridge quickly

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