Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 376 · 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) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
2. 2.True or false: to switch off empty rooms saves electricity. (a) True (b) False
3. 3.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) unplug idle chargers (d) use daylight to read
4. 4.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave fridge door open (d) unplug idle chargers
5. 5.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) close the fridge quickly (d) switch off empty rooms
6. 6.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
7. 7.True or false: to use LED lamps wastes electricity. (a) False (b) True
8. 8.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
9. 9.True or false: to use daylight to read wastes electricity. (a) False (b) True
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) switch off empty rooms (d) use daylight to read
12. 12.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
15. 15.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
16. 16.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
17. 17.🧾 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?
18. 18.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
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 3 hours. How many watt-hours (Wh) are saved?
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.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) use old filament bulbs (d) leave fridge door open
24. 24.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
25. 25.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
26. 26.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
27. 27.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
28. 28.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
32. 32.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
33. 33.🧾 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?
34. 34.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) iron one shirt at a time (d) run fans in empty rooms
35. 35.True or false: to use old filament bulbs saves electricity. (a) False (b) True
36. 36.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to use daylight to read saves electricity. (a) True (b) False
38. 38.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
40. 40.🧾 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?

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