Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 523 · 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 LED lamp (c) an oil lamp (d) a candle
2. 2.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
4. 4.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) unplug idle chargers (d) use old filament bulbs
5. 5.🧾 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?
6. 6.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
7. 7.Which of these wastes electricity? (a) leave fridge door open (b) use LED lamps (c) close the fridge quickly (d) switch off empty rooms
8. 8.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
9. 9.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) run fans in empty rooms (d) switch off empty rooms
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
12. 12.True or false: to use old filament bulbs saves electricity. (a) False (b) True
13. 13.🧾 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?
14. 14.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
16. 16.True or false: to use daylight to read saves electricity. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
18. 18.🧾 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?
19. 19.True or false: to use daylight to read wastes electricity. (a) True (b) False
20. 20.🧾 A family uses 40 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 leave fridge door open? (a) wastes electricity (b) saves electricity
22. 22.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
24. 24.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) leave the TV on standby (d) use LED lamps
26. 26.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) iron one shirt at a time
28. 28.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
29. 29.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) switch off empty rooms
31. 31.True or false: to switch off empty rooms saves electricity. (a) False (b) True
32. 32.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
34. 34.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
35. 35.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
38. 38.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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