Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 274 · 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 use LED lamps wastes electricity. (a) False (b) True
2. 2.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
4. 4.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
5. 5.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
6. 6.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
7. 7.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
8. 8.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
9. 9.True or false: to close the fridge quickly saves electricity. (a) False (b) True
10. 10.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
11. 11.True or false: to unplug idle chargers saves electricity. (a) True (b) False
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
13. 13.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
15. 15.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) use LED lamps (d) switch off empty rooms
16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) use daylight to read
17. 17.True or false: to use LED lamps saves electricity. (a) False (b) True
18. 18.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
19. 19.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
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 8 hours. How many watt-hours (Wh) are saved?
22. 22.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
23. 23.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) use old filament bulbs
24. 24.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
25. 25.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
28. 28.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) set the AC to 24 °C (d) switch off empty rooms
29. 29.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
30. 30.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) run fans in empty rooms
31. 31.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use old filament bulbs (d) leave the TV on standby
33. 33.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) iron one shirt at a time (d) switch off empty rooms
36. 36.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
38. 38.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
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 10 hours. How many watt-hours (Wh) are saved?
40. 40.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms

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