Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 505 · 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.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
2. 2.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) iron one shirt at a time (d) use daylight to read
3. 3.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) unplug idle chargers (d) use LED lamps
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
5. 5.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
6. 6.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) run fans in empty rooms (d) close the fridge quickly
7. 7.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) use LED lamps
9. 9.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) use old filament bulbs
10. 10.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
12. 12.True or false: to use LED lamps saves electricity. (a) True (b) False
13. 13.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
14. 14.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
15. 15.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
16. 16.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
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 8 hours. How many watt-hours (Wh) are saved?
18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
19. 19.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
21. 21.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
23. 23.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) leave fridge door open
24. 24.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
25. 25.True or false: to leave the TV on standby saves electricity. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
27. 27.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
28. 28.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use LED lamps (d) run fans in empty rooms
29. 29.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
31. 31.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
32. 32.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
33. 33.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
34. 34.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
36. 36.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
37. 37.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
38. 38.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
39. 39.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.True or false: to close the fridge quickly saves electricity. (a) False (b) True

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