Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 923 · 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) use LED lamps (b) run fans in empty rooms (c) iron one shirt at a time (d) use old filament bulbs
2. 2.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
4. 4.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
5. 5.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
7. 7.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
8. 8.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) unplug idle chargers
9. 9.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
10. 10.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) run fans in empty rooms (d) set the AC to 24 °C
11. 11.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) run fans in empty rooms (d) iron one shirt at a time
12. 12.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
13. 13.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
14. 14.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) switch off empty rooms (d) unplug idle chargers
16. 16.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
19. 19.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) use old filament bulbs
20. 20.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) set the AC to 24 °C (d) unplug idle chargers
21. 21.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
22. 22.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
23. 23.True or false: to use daylight to read saves electricity. (a) False (b) True
24. 24.True or false: to leave the TV on standby saves electricity. (a) False (b) True
25. 25.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
26. 26.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) switch off empty rooms (d) iron one shirt at a time
27. 27.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
29. 29.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) set the AC to 24 °C (d) switch off empty rooms
30. 30.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
33. 33.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
35. 35.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
36. 36.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) set the AC to 24 °C (d) use old filament bulbs
37. 37.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
38. 38.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
39. 39.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?

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