Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 78 · 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 lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
2. 2.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
3. 3.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
4. 4.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) switch off empty rooms (d) use LED lamps
5. 5.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
6. 6.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
8. 8.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
9. 9.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) close the fridge quickly (d) switch off empty rooms
10. 10.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
11. 11.True or false: to leave the TV on standby saves electricity. (a) True (b) False
12. 12.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
15. 15.True or false: to use daylight to read wastes electricity. (a) False (b) True
16. 16.Which of these wastes electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) use daylight to read (d) unplug idle chargers
17. 17.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) iron one shirt at a time
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
21. 21.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
22. 22.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
23. 23.True or false: to use LED lamps saves electricity. (a) True (b) False
24. 24.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) close the fridge quickly
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) unplug idle chargers
28. 28.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
30. 30.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use LED lamps (d) set the AC to 24 °C
31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
32. 32.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) use LED lamps
33. 33.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
35. 35.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) unplug idle chargers (d) use daylight to read
36. 36.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
37. 37.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
38. 38.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
40. 40.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time

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