Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 378 · 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 of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) leave fridge door open (d) set the AC to 24 °C
2. 2.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) run fans in empty rooms (d) use LED lamps
3. 3.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) iron one shirt at a time (d) use LED lamps
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
5. 5.🧾 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
6. 6.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
8. 8.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) iron one shirt at a time
10. 10.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
14. 14.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open
17. 17.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) run fans in empty rooms
18. 18.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) set the AC to 24 °C
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) iron one shirt at a time
22. 22.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
25. 25.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
26. 26.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
29. 29.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
31. 31.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
32. 32.True or false: to use LED lamps wastes electricity. (a) False (b) True
33. 33.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) set the AC to 24 °C (d) switch off empty rooms
34. 34.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
35. 35.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
36. 36.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
38. 38.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) run fans in empty rooms
40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms

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