Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 277 · 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) leave the TV on standby (b) use daylight to read (c) iron one shirt at a time (d) run fans in empty rooms
2. 2.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
3. 3.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
5. 5.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
6. 6.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
7. 7.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
8. 8.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) use daylight to read (d) set the AC to 24 °C
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
10. 10.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) close the fridge quickly (d) use daylight to read
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
12. 12.🧾 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?
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) use daylight to read
14. 14.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
15. 15.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
16. 16.🧾 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?
17. 17.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) run fans in empty rooms
18. 18.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
19. 19.True or false: to leave fridge door open saves electricity. (a) True (b) False
20. 20.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
21. 21.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) unplug idle chargers
22. 22.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
24. 24.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
25. 25.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.True or false: to switch off empty rooms saves electricity. (a) False (b) True
27. 27.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
31. 31.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
32. 32.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) use LED lamps (d) set the AC to 24 °C
35. 35.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) use old filament bulbs
36. 36.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
37. 37.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
38. 38.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
39. 39.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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