Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 97 · 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 leave fridge door open saves electricity. (a) True (b) False
2. 2.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
3. 3.🧾 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?
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
5. 5.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
7. 7.True or false: to leave fridge door open wastes electricity. (a) False (b) True
8. 8.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
9. 9.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
10. 10.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
11. 11.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) iron one shirt at a time
13. 13.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
14. 14.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
16. 16.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.🧾 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?
19. 19.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
20. 20.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
21. 21.Which of these wastes electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) switch off empty rooms (d) use LED lamps
22. 22.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) close the fridge quickly (d) use LED lamps
23. 23.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) leave fridge door open
24. 24.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
25. 25.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
26. 26.🔍 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) leave fridge door open
27. 27.🧾 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?
28. 28.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) close the fridge quickly
30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
32. 32.True or false: to close the fridge quickly saves electricity. (a) True (b) False
33. 33.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
35. 35.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) leave fridge door open
38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
39. 39.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
40. 40.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) close the fridge quickly (d) leave fridge door open

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