Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 218 · 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 leave fridge door open? (a) saves electricity (b) wastes electricity
2. 2.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
3. 3.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
4. 4.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
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 3 hours. How many watt-hours (Wh) are saved?
6. 6.True or false: to leave the TV on standby saves electricity. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) switch off empty rooms (d) use old filament bulbs
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.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
10. 10.🧾 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?
11. 11.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
12. 12.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
13. 13.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) unplug idle chargers (d) set the AC to 24 °C
14. 14.🧾 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?
15. 15.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
16. 16.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
17. 17.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) unplug idle chargers (d) use daylight to read
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) switch off empty rooms (d) use old filament bulbs
19. 19.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
20. 20.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) use daylight to read (d) use old filament bulbs
21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
22. 22.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) close the fridge quickly
23. 23.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
24. 24.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) leave fridge door open (d) use daylight to read
25. 25.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) close the fridge quickly
26. 26.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use daylight to read (d) iron one shirt at a time
30. 30.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
31. 31.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
32. 32.True or false: to use daylight to read wastes electricity. (a) True (b) False
33. 33.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
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) use daylight to read (b) close the fridge quickly (c) run fans in empty rooms (d) set the AC to 24 °C
36. 36.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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