Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 788 · 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 switch off empty rooms saves electricity. (a) True (b) False
2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
3. 3.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
4. 4.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
5. 5.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) leave the TV on standby (d) close the fridge quickly
6. 6.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
8. 8.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) switch off empty rooms (d) close the fridge quickly
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
10. 10.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
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.True or false: to leave fridge door open wastes electricity. (a) True (b) False
13. 13.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) switch off empty rooms
14. 14.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
15. 15.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
17. 17.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) switch off empty rooms (d) use daylight to read
18. 18.True or false: to leave fridge door open saves electricity. (a) True (b) False
19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
20. 20.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) close the fridge quickly (d) unplug idle chargers
21. 21.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 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?
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
25. 25.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
27. 27.🧾 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?
28. 28.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) set the AC to 24 °C (d) switch off empty rooms
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers
30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
31. 31.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
32. 32.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) leave fridge door open (d) use daylight to read
33. 33.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) leave fridge door open
39. 39.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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