Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 708 · 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 use old filament bulbs? (a) saves electricity (b) wastes electricity
2. 2.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
3. 3.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) use old filament bulbs (d) iron one shirt at a time
4. 4.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) run fans in empty rooms
5. 5.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) use old filament bulbs
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
7. 7.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
8. 8.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) leave fridge door open (d) set the AC to 24 °C
11. 11.🧾 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?
12. 12.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
13. 13.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
14. 14.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
15. 15.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
17. 17.True or false: to use old filament bulbs saves electricity. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) set the AC to 24 °C (d) switch off empty rooms
19. 19.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) set the AC to 24 °C (d) use daylight to read
20. 20.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) leave the TV on standby (d) use LED lamps
21. 21.True or false: to leave the TV on standby saves electricity. (a) True (b) False
22. 22.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
23. 23.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
25. 25.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) switch off empty rooms (d) close the fridge quickly
26. 26.🧾 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?
27. 27.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
28. 28.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
29. 29.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to use daylight to read wastes electricity. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) close the fridge quickly (d) leave fridge door open
32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
33. 33.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
36. 36.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) use LED lamps (d) set the AC to 24 °C
37. 37.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) iron one shirt at a time
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
39. 39.True or false: to use LED lamps saves electricity. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby

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