Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 354 · 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) set the AC to 24 °C (b) switch off empty rooms (c) run fans in empty rooms (d) use daylight to read
2. 2.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) switch off empty rooms (d) run fans in empty rooms
3. 3.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) switch off empty rooms (d) use daylight to read
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
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 3 hours. How many watt-hours (Wh) are saved?
6. 6.True or false: to leave the TV on standby saves electricity. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) iron one shirt at a time
8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
9. 9.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
10. 10.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
11. 11.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
14. 14.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) use LED lamps
15. 15.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
16. 16.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
17. 17.True or false: to use LED lamps wastes electricity. (a) True (b) False
18. 18.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
20. 20.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
22. 22.🧾 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?
23. 23.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
24. 24.🧾 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?
25. 25.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
26. 26.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) close the fridge quickly
27. 27.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
29. 29.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) leave fridge door open
31. 31.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) unplug idle chargers (d) set the AC to 24 °C
33. 33.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
34. 34.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
35. 35.True or false: to use daylight to read wastes electricity. (a) False (b) True
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to leave fridge door open wastes electricity. (a) False (b) True
38. 38.True or false: to use daylight to read saves electricity. (a) False (b) True
39. 39.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) use old filament bulbs (d) unplug idle chargers
40. 40.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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