Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 55 · 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 iron one shirt at a time? (a) wastes electricity (b) saves electricity
2. 2.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) use daylight to read (d) run fans in empty rooms
3. 3.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) close the fridge quickly (d) unplug idle chargers
4. 4.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
5. 5.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
6. 6.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
7. 7.True or false: to use daylight to read wastes electricity. (a) True (b) False
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
9. 9.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) iron one shirt at a time (d) use daylight to read
10. 10.True or false: to unplug idle chargers saves electricity. (a) False (b) True
11. 11.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
12. 12.True or false: to use LED lamps saves electricity. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) switch off empty rooms (d) unplug idle chargers
14. 14.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) close the fridge quickly (d) use old filament bulbs
15. 15.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use LED lamps (d) close the fridge quickly
18. 18.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to use daylight to read saves electricity. (a) False (b) True
22. 22.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) leave the TV on standby (d) set the AC to 24 °C
23. 23.True or false: to use old filament bulbs saves electricity. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) use old filament bulbs (d) close the fridge quickly
25. 25.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
26. 26.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) unplug idle chargers
27. 27.True or false: to leave fridge door open wastes electricity. (a) True (b) False
28. 28.🧾 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
29. 29.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 100 W filament bulb is swapped for a 15 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) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
33. 33.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) use daylight to read
34. 34.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
35. 35.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
36. 36.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
40. 40.True or false: to switch off empty rooms saves electricity. (a) False (b) True

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