Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 145 · 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 LED lamps (b) run fans in empty rooms (c) switch off empty rooms (d) unplug idle chargers
2. 2.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) use LED lamps (d) unplug idle chargers
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
4. 4.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) leave fridge door open (d) leave the TV on standby
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
7. 7.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
8. 8.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
9. 9.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
12. 12.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) set the AC to 24 °C (d) unplug idle chargers
14. 14.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) leave the TV on standby (d) use old filament bulbs
15. 15.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
17. 17.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) run fans in empty rooms
19. 19.True or false: to use daylight to read saves electricity. (a) True (b) False
20. 20.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) run fans in empty rooms (d) leave fridge door open
21. 21.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
22. 22.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) unplug idle chargers (d) leave fridge door open
23. 23.True or false: to close the fridge quickly saves electricity. (a) False (b) True
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) use daylight to read (d) leave the TV on standby
25. 25.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) leave the TV on standby (d) run fans in empty rooms
26. 26.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
27. 27.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) set the AC to 24 °C (d) leave the TV on standby
29. 29.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
30. 30.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
31. 31.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) leave the TV on standby (d) use LED lamps
32. 32.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) unplug idle chargers (d) use old filament bulbs
35. 35.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
37. 37.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 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?
40. 40.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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