Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 546 · 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) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
2. 2.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
3. 3.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
5. 5.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
7. 7.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
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 10 hours. How many watt-hours (Wh) are saved?
9. 9.True or false: to leave fridge door open wastes electricity. (a) True (b) False
10. 10.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.Which of these wastes electricity? (a) leave fridge door open (b) use LED lamps (c) use daylight to read (d) switch off empty rooms
12. 12.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) close the fridge quickly
15. 15.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
16. 16.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) close the fridge quickly (d) use old filament bulbs
18. 18.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
19. 19.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) unplug idle chargers (d) run fans in empty rooms
20. 20.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) run fans in empty rooms (d) set the AC to 24 °C
21. 21.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
22. 22.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
23. 23.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
24. 24.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
25. 25.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms
27. 27.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
29. 29.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) use daylight to read (d) use LED lamps
31. 31.True or false: to use LED lamps wastes electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) close the fridge quickly (d) unplug idle chargers
33. 33.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
34. 34.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
36. 36.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
37. 37.True or false: to use old filament bulbs saves electricity. (a) True (b) False
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 10 hours. How many watt-hours (Wh) are saved?
39. 39.True or false: to use LED lamps saves electricity. (a) False (b) True
40. 40.True or false: to use daylight to read saves electricity. (a) True (b) False

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