Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 245 · 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) use old filament bulbs (b) switch off empty rooms (c) unplug idle chargers (d) use daylight to read
2. 2.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) leave fridge door open (d) use LED lamps
3. 3.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) iron one shirt at a time
4. 4.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
5. 5.🔍 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) use LED lamps
6. 6.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) unplug idle chargers
7. 7.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 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?
9. 9.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
10. 10.🧾 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?
11. 11.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
12. 12.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
13. 13.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
16. 16.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) use LED lamps
18. 18.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
19. 19.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) run fans in empty rooms
20. 20.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) iron one shirt at a time
21. 21.True or false: to use LED lamps wastes electricity. (a) False (b) True
22. 22.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
24. 24.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
25. 25.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) switch off empty rooms (d) use LED lamps
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) run fans in empty rooms (d) leave the TV on standby
27. 27.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.🔍 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) switch off empty rooms
30. 30.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) use old filament bulbs (d) run fans in empty rooms
31. 31.🧾 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?
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
33. 33.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
34. 34.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
35. 35.True or false: to switch off empty rooms saves electricity. (a) True (b) False
36. 36.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
37. 37.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use daylight to read (d) run fans in empty rooms
39. 39.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere

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