Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 320 · 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.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
2. 2.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
4. 4.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) run fans in empty rooms
5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
6. 6.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
7. 7.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
8. 8.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
10. 10.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
11. 11.🧾 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
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 3 hours. How many watt-hours (Wh) are saved?
13. 13.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) switch off empty rooms (d) iron one shirt at a time
15. 15.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
16. 16.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
17. 17.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
21. 21.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) leave the TV on standby (d) set the AC to 24 °C
22. 22.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) unplug idle chargers (d) use old filament bulbs
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
24. 24.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) leave fridge door open
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) set the AC to 24 °C (d) use daylight to read
27. 27.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
28. 28.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
29. 29.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) iron one shirt at a time (d) leave the TV on standby
30. 30.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
32. 32.True or false: to switch off empty rooms saves electricity. (a) True (b) False
33. 33.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
35. 35.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) unplug idle chargers (d) iron one shirt at a time
37. 37.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
39. 39.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

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