Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 825 · 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 of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
2. 2.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
3. 3.True or false: to leave fridge door open saves electricity. (a) False (b) True
4. 4.🧾 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?
5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
6. 6.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
7. 7.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) switch off empty rooms (d) unplug idle chargers
9. 9.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
12. 12.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
13. 13.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
15. 15.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
16. 16.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) unplug idle chargers (d) use old filament bulbs
17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) switch off empty rooms (d) run fans in empty rooms
18. 18.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.True or false: to leave fridge door open wastes electricity. (a) False (b) True
20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
21. 21.🧾 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?
22. 22.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
23. 23.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.True or false: to unplug idle chargers saves electricity. (a) False (b) True
26. 26.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) unplug idle chargers
27. 27.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) switch off empty rooms (d) leave fridge door open
29. 29.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
30. 30.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) unplug idle chargers (d) use old filament bulbs
31. 31.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) switch off empty rooms (d) iron one shirt at a time
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
34. 34.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
35. 35.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
36. 36.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) use old filament bulbs
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 7 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
40. 40.True or false: to use daylight to read saves electricity. (a) False (b) True

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