Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 322 · 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) run fans in empty rooms (c) leave the TV on standby (d) close the fridge quickly
2. 2.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
3. 3.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) use LED lamps (d) use daylight to read
4. 4.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
5. 5.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) iron one shirt at a time
6. 6.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
7. 7.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) run fans in empty rooms
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
9. 9.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) use daylight to read (d) leave the TV on standby
10. 10.Which of these wastes electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) switch off empty rooms (d) use daylight to read
11. 11.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
12. 12.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
13. 13.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
14. 14.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
17. 17.🧾 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?
18. 18.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
19. 19.True or false: to use LED lamps wastes electricity. (a) True (b) False
20. 20.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) iron one shirt at a time
22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
23. 23.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
24. 24.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.True or false: to leave the TV on standby saves electricity. (a) False (b) True
26. 26.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
27. 27.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) set the AC to 24 °C
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
29. 29.True or false: to use daylight to read wastes electricity. (a) True (b) False
30. 30.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) switch off empty rooms (d) iron one shirt at a time
31. 31.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
33. 33.True or false: to switch off empty rooms saves electricity. (a) False (b) True
34. 34.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
35. 35.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) use daylight to read
36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use LED lamps (d) set the AC to 24 °C
37. 37.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
40. 40.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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