Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 618 · 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.True or false: to leave fridge door open saves electricity. (a) False (b) True
2. 2.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
3. 3.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) leave fridge door open (d) run fans in empty rooms
4. 4.🧾 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?
5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
6. 6.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
8. 8.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) use daylight to read
9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
10. 10.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
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 8 hours. How many watt-hours (Wh) are saved?
13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) iron one shirt at a time (d) unplug idle chargers
14. 14.True or false: to close the fridge quickly saves electricity. (a) True (b) False
15. 15.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
16. 16.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) unplug idle chargers (d) use old filament bulbs
17. 17.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) close the fridge quickly (d) unplug idle chargers
21. 21.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) use LED lamps (d) close the fridge quickly
22. 22.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
23. 23.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
25. 25.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms
26. 26.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) set the AC to 24 °C (d) switch off empty rooms
27. 27.🧾 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?
28. 28.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) use old filament bulbs (d) leave fridge door open
30. 30.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
31. 31.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
33. 33.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
35. 35.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) switch off empty rooms
36. 36.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) iron one shirt at a time (d) use daylight to read
39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
40. 40.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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