Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 267 · 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) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) unplug idle chargers
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) close the fridge quickly
3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) iron one shirt at a time (d) use old filament bulbs
4. 4.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
5. 5.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
6. 6.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) iron one shirt at a time (d) close the fridge quickly
7. 7.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
9. 9.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) set the AC to 24 °C (d) use daylight to read
11. 11.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
14. 14.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
15. 15.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave fridge door open (d) unplug idle chargers
16. 16.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
17. 17.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
19. 19.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) use LED lamps (d) run fans in empty rooms
20. 20.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 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?
22. 22.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
23. 23.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
24. 24.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) close the fridge quickly (d) iron one shirt at a time
25. 25.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) switch off empty rooms (d) leave the TV on standby
26. 26.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
27. 27.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.True or false: to use daylight to read wastes electricity. (a) True (b) False
29. 29.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) unplug idle chargers
30. 30.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) leave fridge door open (d) switch off empty rooms
32. 32.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
33. 33.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
35. 35.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
36. 36.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
37. 37.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
38. 38.🧾 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?
39. 39.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
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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