Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 631 · 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 LED lamps (b) switch off empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
2. 2.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
3. 3.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
5. 5.True or false: to use old filament bulbs saves electricity. (a) False (b) True
6. 6.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
7. 7.True or false: to unplug idle chargers saves electricity. (a) False (b) True
8. 8.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
9. 9.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) leave fridge door open
10. 10.True or false: to leave fridge door open wastes electricity. (a) False (b) True
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) use daylight to read
13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
14. 14.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) use old filament bulbs (d) switch off empty rooms
15. 15.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
16. 16.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
18. 18.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) run fans in empty rooms
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
20. 20.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
21. 21.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) unplug idle chargers
23. 23.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) use LED lamps (d) unplug idle chargers
24. 24.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
26. 26.True or false: to use LED lamps saves electricity. (a) False (b) True
27. 27.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
29. 29.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) iron one shirt at a time
30. 30.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) switch off empty rooms (d) set the AC to 24 °C
32. 32.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
34. 34.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
35. 35.True or false: to close the fridge quickly saves electricity. (a) False (b) True
36. 36.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
37. 37.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) close the fridge quickly
38. 38.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.🔍 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) use LED lamps
40. 40.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True

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