Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 306 · 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 set the AC to 24 °C wastes electricity. (a) True (b) False
2. 2.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
3. 3.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
5. 5.True or false: to unplug idle chargers saves electricity. (a) True (b) False
6. 6.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
7. 7.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) switch off empty rooms (d) use LED lamps
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
9. 9.True or false: to use daylight to read saves electricity. (a) True (b) False
10. 10.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
11. 11.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
13. 13.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) unplug idle chargers (d) leave the TV on standby
15. 15.True or false: to use daylight to read wastes electricity. (a) False (b) True
16. 16.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
17. 17.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
19. 19.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave fridge door open
22. 22.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.True or false: to use old filament bulbs saves electricity. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) switch off empty rooms
26. 26.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
27. 27.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) close the fridge quickly (d) set the AC to 24 °C
28. 28.True or false: to use LED lamps saves electricity. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) run fans in empty rooms (d) use daylight to read
30. 30.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.🧾 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?
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) use old filament bulbs (d) set the AC to 24 °C
33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
34. 34.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) switch off empty rooms (d) unplug idle chargers
36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
37. 37.🧾 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?
38. 38.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) switch off empty rooms (d) use LED lamps
39. 39.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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