Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 582 · 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 is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
2. 2.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
3. 3.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 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?
5. 5.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) switch off empty rooms (d) iron one shirt at a time
6. 6.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
7. 7.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
8. 8.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) leave fridge door open (d) switch off empty rooms
9. 9.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
10. 10.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
11. 11.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
13. 13.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) use LED lamps
16. 16.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) use daylight to read (d) switch off empty rooms
18. 18.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms
21. 21.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
22. 22.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) use old filament bulbs
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
24. 24.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
25. 25.True or false: to close the fridge quickly saves electricity. (a) False (b) True
26. 26.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
27. 27.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
28. 28.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) unplug idle chargers
30. 30.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to use LED lamps wastes electricity. (a) True (b) False
32. 32.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
33. 33.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to use daylight to read saves electricity. (a) True (b) False
35. 35.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
37. 37.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
38. 38.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
40. 40.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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