Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 769 · 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.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use daylight to read (d) use old filament bulbs
2. 2.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
4. 4.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use daylight to read (d) set the AC to 24 °C
5. 5.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) switch off empty rooms (d) use old filament bulbs
6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
7. 7.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
8. 8.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
10. 10.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms
11. 11.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
13. 13.True or false: to use LED lamps saves electricity. (a) False (b) True
14. 14.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
15. 15.True or false: to use old filament bulbs saves electricity. (a) False (b) True
16. 16.True or false: to close the fridge quickly saves electricity. (a) False (b) True
17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) unplug idle chargers
18. 18.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
19. 19.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
21. 21.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
23. 23.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
24. 24.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
25. 25.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
26. 26.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
29. 29.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
31. 31.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) use LED lamps (d) iron one shirt at a time
33. 33.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) run fans in empty rooms (d) set the AC to 24 °C
34. 34.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) use daylight to read
36. 36.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
37. 37.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) use daylight to read (d) unplug idle chargers
38. 38.🧾 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?
39. 39.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle

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