Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 165 · 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 use old filament bulbs saves electricity. (a) True (b) False
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) close the fridge quickly (d) iron one shirt at a time
3. 3.True or false: to leave fridge door open saves electricity. (a) False (b) True
4. 4.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
5. 5.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
6. 6.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) use daylight to read
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
8. 8.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) switch off empty rooms (d) run fans in empty rooms
10. 10.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
11. 11.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) set the AC to 24 °C
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
14. 14.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
16. 16.True or false: to close the fridge quickly saves electricity. (a) False (b) True
17. 17.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
19. 19.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) iron one shirt at a time
22. 22.🧾 A family uses 30 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) run fans in empty rooms (b) use LED lamps (c) leave fridge door open (d) leave the TV on standby
24. 24.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
28. 28.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) run fans in empty rooms
29. 29.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
30. 30.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) leave the TV on standby (d) switch off empty rooms
34. 34.True or false: to leave fridge door open wastes electricity. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) close the fridge quickly (d) switch off empty rooms
36. 36.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
37. 37.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
38. 38.🧾 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?
39. 39.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.🧾 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?

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