Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 106 · 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) iron one shirt at a time (b) unplug idle chargers (c) leave fridge door open (d) leave the TV on standby
2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
3. 3.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 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?
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
6. 6.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
9. 9.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
11. 11.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
13. 13.True or false: to use daylight to read wastes electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
15. 15.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
16. 16.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) leave fridge door open
17. 17.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
18. 18.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use LED lamps (d) use old filament bulbs
19. 19.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) leave fridge door open
20. 20.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) close the fridge quickly (d) use LED lamps
21. 21.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) use old filament bulbs (d) set the AC to 24 °C
22. 22.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
24. 24.🧾 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?
25. 25.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.🔍 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
27. 27.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
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.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
30. 30.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) use daylight to read
33. 33.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
34. 34.🧾 A 250 W appliance runs for 4 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) leave the TV on standby (d) use old filament bulbs
36. 36.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) set the AC to 24 °C (d) leave the TV on standby
37. 37.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
38. 38.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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