Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 483 · 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) use old filament bulbs (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
3. 3.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
4. 4.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
6. 6.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
8. 8.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) use LED lamps
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) switch off empty rooms (d) close the fridge quickly
11. 11.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
13. 13.True or false: to close the fridge quickly saves electricity. (a) False (b) True
14. 14.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
16. 16.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
17. 17.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
18. 18.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (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) iron one shirt at a time (c) use daylight to read (d) leave the TV on standby
21. 21.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) use LED lamps (d) set the AC to 24 °C
24. 24.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
25. 25.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
26. 26.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.True or false: to use daylight to read saves electricity. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
30. 30.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
31. 31.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
34. 34.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
37. 37.True or false: to use LED lamps saves electricity. (a) True (b) False
38. 38.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) iron one shirt at a time (d) use LED lamps
39. 39.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) use old filament bulbs
40. 40.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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