Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 749 · 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 fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) iron one shirt at a time
3. 3.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
5. 5.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
7. 7.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) close the fridge quickly (d) use LED lamps
8. 8.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
10. 10.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) unplug idle chargers (d) leave the TV on standby
11. 11.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) use old filament bulbs
12. 12.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) use daylight to read (d) switch off empty rooms
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
15. 15.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
16. 16.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) close the fridge quickly (d) switch off empty rooms
18. 18.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
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 3 hours. How many watt-hours (Wh) are saved?
20. 20.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) unplug idle chargers (d) leave fridge door open
21. 21.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
22. 22.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) run fans in empty rooms
23. 23.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.🧾 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?
25. 25.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
27. 27.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
28. 28.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
29. 29.🧾 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?
30. 30.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
31. 31.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
33. 33.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) close the fridge quickly (d) iron one shirt at a time
34. 34.🧾 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?
35. 35.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) leave fridge door open (d) run fans in empty rooms
36. 36.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) use daylight to read
38. 38.Which of these wastes electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) switch off empty rooms (d) set the AC to 24 °C
39. 39.Which of these wastes electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) use daylight to read (d) use LED lamps
40. 40.True or false: to use LED lamps wastes electricity. (a) True (b) False

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