Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 96 · 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 unplug idle chargers wastes electricity. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) unplug idle chargers (d) leave fridge door open
3. 3.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
4. 4.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) iron one shirt at a time
5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) use daylight to read
6. 6.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave fridge door open (d) unplug idle chargers
7. 7.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
9. 9.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
11. 11.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) leave the TV on standby
12. 12.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
13. 13.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
14. 14.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) leave the TV on standby
15. 15.🧾 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
16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) leave fridge door open (d) switch off empty rooms
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave fridge door open
18. 18.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
19. 19.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
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) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
23. 23.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
24. 24.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) use old filament bulbs
25. 25.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) run fans in empty rooms (d) iron one shirt at a time
26. 26.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
27. 27.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) close the fridge quickly
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) close the fridge quickly
29. 29.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) use daylight to read (d) leave the TV on standby
30. 30.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
33. 33.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
36. 36.True or false: to use LED lamps saves electricity. (a) False (b) True
37. 37.True or false: to use daylight to read wastes electricity. (a) False (b) True
38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
39. 39.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) switch off empty rooms
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?

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