Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 459 · 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 is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) leave fridge door open (d) iron one shirt at a time
2. 2.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
3. 3.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) run fans in empty rooms
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 2 hours. How many watt-hours (Wh) are saved?
5. 5.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) use daylight to read
7. 7.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
8. 8.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
12. 12.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
13. 13.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
15. 15.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
17. 17.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
18. 18.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
19. 19.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
20. 20.🧾 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?
21. 21.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
23. 23.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
25. 25.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
27. 27.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave fridge door open (d) close the fridge quickly
28. 28.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) leave the TV on standby (d) unplug idle chargers
30. 30.True or false: to use LED lamps wastes electricity. (a) False (b) True
31. 31.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) iron one shirt at a time
33. 33.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to leave fridge door open saves electricity. (a) True (b) False
35. 35.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms
37. 37.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to use daylight to read wastes electricity. (a) False (b) True

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