Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 439 · 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) switch off empty rooms (b) leave fridge door open (c) use daylight to read (d) unplug idle chargers
2. 2.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
3. 3.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
5. 5.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) iron one shirt at a time (d) switch off empty rooms
9. 9.True or false: to leave fridge door open saves electricity. (a) False (b) True
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
13. 13.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
14. 14.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) leave the TV on standby
15. 15.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
16. 16.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
17. 17.True or false: to use LED lamps saves electricity. (a) True (b) False
18. 18.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) run fans in empty rooms
20. 20.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
21. 21.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
22. 22.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use daylight to read (d) run fans in empty rooms
23. 23.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
24. 24.🧾 A 1000 W appliance runs for 5 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 10 hours. How many watt-hours (Wh) are saved?
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
28. 28.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
29. 29.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) run fans in empty rooms (d) switch off empty rooms
30. 30.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) unplug idle chargers (d) iron one shirt at a time
31. 31.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use LED lamps (d) use daylight to read
32. 32.True or false: to switch off empty rooms saves electricity. (a) False (b) True
33. 33.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
36. 36.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
37. 37.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
38. 38.True or false: to leave the TV on standby saves electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
40. 40.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms

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