Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 998 · 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.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
2. 2.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave the TV on standby (d) set the AC to 24 °C
3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) close the fridge quickly (d) use daylight to read
4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
5. 5.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) switch off empty rooms (d) use old filament bulbs
6. 6.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) iron one shirt at a time (d) use LED lamps
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) leave fridge door open
8. 8.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) switch off empty rooms (d) run fans in empty rooms
9. 9.True or false: to use LED lamps wastes electricity. (a) True (b) False
10. 10.True or false: to use daylight to read saves electricity. (a) False (b) True
11. 11.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
12. 12.True or false: to use LED lamps saves electricity. (a) True (b) False
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
14. 14.🧾 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?
15. 15.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
16. 16.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
17. 17.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
18. 18.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) run fans in empty rooms
19. 19.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) iron one shirt at a time
20. 20.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) use old filament bulbs
21. 21.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
22. 22.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
23. 23.True or false: to leave fridge door open saves electricity. (a) True (b) False
24. 24.True or false: to use old filament bulbs saves electricity. (a) True (b) False
25. 25.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
26. 26.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
27. 27.True or false: to leave the TV on standby saves electricity. (a) False (b) True
28. 28.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
29. 29.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to switch off empty rooms saves electricity. (a) False (b) True
31. 31.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) leave fridge door open (d) use daylight to read
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
34. 34.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
36. 36.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
40. 40.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C

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