Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 103 · 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 saves electricity. (a) True (b) False
2. 2.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
4. 4.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
5. 5.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
6. 6.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 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?
8. 8.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) unplug idle chargers (d) use LED lamps
9. 9.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use old filament bulbs (d) iron one shirt at a time
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.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) leave fridge door open
13. 13.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
15. 15.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
16. 16.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
17. 17.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
18. 18.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use old filament bulbs (d) close the fridge quickly
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
21. 21.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
22. 22.True or false: to use LED lamps saves electricity. (a) True (b) False
23. 23.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) leave fridge door open (d) set the AC to 24 °C
24. 24.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) unplug idle chargers (d) switch off empty rooms
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 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?
29. 29.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
30. 30.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) switch off empty rooms (d) set the AC to 24 °C
31. 31.True or false: to use daylight to read wastes electricity. (a) False (b) True
32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
34. 34.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.True or false: to leave the TV on standby saves electricity. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave fridge door open (d) close the fridge quickly
37. 37.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
39. 39.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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