Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 549 · 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) leave fridge door open (b) use daylight to read (c) iron one shirt at a time (d) run fans in empty rooms
2. 2.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
3. 3.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
4. 4.🧾 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?
5. 5.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
9. 9.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
10. 10.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
11. 11.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) switch off empty rooms
13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use LED lamps (d) use daylight to read
14. 14.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
15. 15.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
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 7 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
20. 20.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
21. 21.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
23. 23.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) leave fridge door open (d) use old filament bulbs
24. 24.🧾 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?
25. 25.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
27. 27.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) iron one shirt at a time (d) leave fridge door open
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use daylight to read (d) leave fridge door open
29. 29.True or false: to unplug idle chargers saves electricity. (a) True (b) False
30. 30.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
31. 31.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to use daylight to read wastes electricity. (a) True (b) False
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
35. 35.True or false: to use LED lamps wastes electricity. (a) False (b) True
36. 36.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
37. 37.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) set the AC to 24 °C (d) use daylight to read
38. 38.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) iron one shirt at a time (d) use daylight to read
39. 39.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) leave the TV on standby (d) use LED lamps
40. 40.True or false: to leave the TV on standby wastes electricity. (a) False (b) True

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