Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 711 · 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 saves electricity? (a) use old filament bulbs (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
2. 2.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
3. 3.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
5. 5.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
7. 7.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
8. 8.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) close the fridge quickly (d) use LED lamps
9. 9.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) run fans in empty rooms (d) leave the TV on standby
11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) switch off empty rooms (d) use old filament bulbs
12. 12.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
14. 14.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
15. 15.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave fridge door open (d) use LED lamps
17. 17.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
18. 18.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
19. 19.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.True or false: to unplug idle chargers saves electricity. (a) False (b) True
22. 22.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) switch off empty rooms (d) leave the TV on standby
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
25. 25.True or false: to close the fridge quickly saves electricity. (a) False (b) True
26. 26.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
27. 27.True or false: to use LED lamps wastes electricity. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) iron one shirt at a time (d) set the AC to 24 °C
29. 29.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) switch off empty rooms (d) use daylight to read
30. 30.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
31. 31.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
32. 32.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
33. 33.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
35. 35.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
37. 37.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) switch off empty rooms (d) use daylight to read
38. 38.True or false: to leave the TV on standby saves electricity. (a) False (b) True
39. 39.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
40. 40.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

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