Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 745 · 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 lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
2. 2.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) close the fridge quickly (d) unplug idle chargers
3. 3.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) iron one shirt at a time
5. 5.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) use daylight to read (d) run fans in empty rooms
6. 6.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
7. 7.True or false: to unplug idle chargers saves electricity. (a) True (b) False
8. 8.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.True or false: to use old filament bulbs saves electricity. (a) False (b) True
10. 10.True or false: to use LED lamps saves electricity. (a) True (b) False
11. 11.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
12. 12.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) use LED lamps (d) close the fridge quickly
13. 13.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
14. 14.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
15. 15.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) switch off empty rooms (d) iron one shirt at a time
16. 16.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
17. 17.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
19. 19.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
21. 21.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
22. 22.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) use old filament bulbs
23. 23.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) run fans in empty rooms (d) use daylight to read
24. 24.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
25. 25.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use LED lamps (d) iron one shirt at a time
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
27. 27.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) set the AC to 24 °C (d) switch off empty rooms
28. 28.🧾 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?
29. 29.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.🧾 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?
31. 31.🔍 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) set the AC to 24 °C
32. 32.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) unplug idle chargers (d) leave fridge door open
34. 34.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
35. 35.🧾 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?
36. 36.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
37. 37.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use LED lamps (d) switch off empty rooms
38. 38.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
39. 39.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity

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