Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 656 · 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.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
3. 3.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
5. 5.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
7. 7.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
8. 8.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
9. 9.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
10. 10.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) set the AC to 24 °C
11. 11.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) use old filament bulbs
13. 13.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
14. 14.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
16. 16.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
17. 17.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) iron one shirt at a time (d) use daylight to read
18. 18.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
19. 19.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) use LED lamps (d) switch off empty rooms
20. 20.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
22. 22.True or false: to unplug idle chargers saves electricity. (a) False (b) True
23. 23.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
25. 25.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
26. 26.🧾 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?
27. 27.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use LED lamps (d) set the AC to 24 °C
28. 28.🔍 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
29. 29.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) set the AC to 24 °C (d) unplug idle chargers
31. 31.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
32. 32.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) switch off empty rooms
33. 33.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use daylight to read (d) set the AC to 24 °C
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
35. 35.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
36. 36.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
38. 38.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.True or false: to use old filament bulbs saves electricity. (a) False (b) True
40. 40.True or false: to use daylight to read saves electricity. (a) True (b) False

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