Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 554 · 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 of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) close the fridge quickly (d) switch off empty rooms
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
3. 3.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
4. 4.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
6. 6.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) use old filament bulbs
7. 7.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
8. 8.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
9. 9.🧾 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?
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 10 hours. How many watt-hours (Wh) are saved?
11. 11.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) leave fridge door open
12. 12.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) use old filament bulbs (d) iron one shirt at a time
13. 13.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
14. 14.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) unplug idle chargers (d) switch off empty rooms
16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) set the AC to 24 °C (d) unplug idle chargers
17. 17.True or false: to use LED lamps wastes electricity. (a) False (b) True
18. 18.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
19. 19.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
20. 20.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
21. 21.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) use old filament bulbs
23. 23.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
24. 24.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) leave fridge door open
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
27. 27.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
28. 28.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) set the AC to 24 °C
30. 30.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) set the AC to 24 °C (d) use old filament bulbs
32. 32.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
33. 33.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) switch off 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 5 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to use daylight to read saves electricity. (a) True (b) False
38. 38.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
40. 40.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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