Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 348 · 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 wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) switch off empty rooms (d) leave fridge door open
2. 2.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) switch off empty rooms (d) use daylight to read
3. 3.True or false: to switch off empty rooms saves electricity. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) iron one shirt at a time
5. 5.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
6. 6.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
7. 7.🧾 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
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
9. 9.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
11. 11.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) use LED lamps (d) switch off empty rooms
13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
15. 15.True or false: to use LED lamps saves electricity. (a) True (b) False
16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
17. 17.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
19. 19.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
20. 20.True or false: to leave fridge door open wastes electricity. (a) False (b) True
21. 21.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
23. 23.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
24. 24.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 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?
26. 26.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
28. 28.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
30. 30.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
32. 32.True or false: to leave the TV on standby saves electricity. (a) True (b) False
33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) iron one shirt at a time
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
35. 35.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
36. 36.🧾 A family uses 150 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 fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
38. 38.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
39. 39.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) run fans in empty rooms (d) close the fridge quickly
40. 40.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby

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