Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 915 · 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 use daylight to read wastes electricity. (a) True (b) False
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
3. 3.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
4. 4.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) iron one shirt at a time (d) leave fridge door open
6. 6.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
7. 7.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) leave fridge door open (d) use LED lamps
8. 8.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
11. 11.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
13. 13.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) run fans in empty rooms (d) switch off empty rooms
14. 14.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
15. 15.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
18. 18.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
20. 20.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
21. 21.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
22. 22.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) set the AC to 24 °C
23. 23.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
24. 24.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) use LED lamps (d) set the AC to 24 °C
25. 25.True or false: to leave fridge door open wastes electricity. (a) False (b) True
26. 26.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
27. 27.True or false: to unplug idle chargers saves electricity. (a) True (b) False
28. 28.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open
29. 29.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to leave the TV on standby saves electricity. (a) True (b) False
32. 32.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
33. 33.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
35. 35.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
36. 36.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) leave fridge door open (d) iron one shirt at a time
37. 37.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) use daylight to read (d) switch off empty rooms
39. 39.True or false: to use LED lamps wastes electricity. (a) True (b) False
40. 40.🧾 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?

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