Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 134 · 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) unplug idle chargers (b) use daylight to read (c) switch off empty rooms (d) iron one shirt at a time
2. 2.True or false: to use old filament bulbs saves electricity. (a) False (b) True
3. 3.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) run fans in empty rooms (d) iron one shirt at a time
4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) use old filament bulbs
5. 5.True or false: to use LED lamps saves electricity. (a) False (b) True
6. 6.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
7. 7.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
9. 9.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to use LED lamps wastes electricity. (a) False (b) True
11. 11.🧾 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?
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
13. 13.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
14. 14.True or false: to leave fridge door open wastes electricity. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
16. 16.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) use daylight to read (d) use LED lamps
18. 18.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
19. 19.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
21. 21.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
22. 22.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
24. 24.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
25. 25.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) use LED lamps (d) set the AC to 24 °C
26. 26.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
27. 27.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) leave the TV on standby
28. 28.True or false: to use daylight to read saves electricity. (a) False (b) True
29. 29.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
31. 31.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
33. 33.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
35. 35.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
36. 36.🧾 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?
37. 37.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) switch off empty rooms

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