Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 550 · 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 wastes electricity. (a) False (b) True
2. 2.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
3. 3.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) iron one shirt at a time (d) run fans in empty rooms
5. 5.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use daylight to read (d) use LED lamps
6. 6.True or false: to use daylight to read wastes electricity. (a) True (b) False
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 8 hours. How many watt-hours (Wh) are saved?
8. 8.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) switch off empty rooms (d) leave fridge door open
9. 9.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) leave fridge door open
10. 10.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
11. 11.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
13. 13.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
15. 15.True or false: to leave fridge door open wastes electricity. (a) True (b) False
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
17. 17.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
18. 18.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) switch off empty rooms (d) set the AC to 24 °C
19. 19.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) use old filament bulbs (d) unplug idle chargers
20. 20.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
21. 21.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
23. 23.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
24. 24.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
26. 26.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
29. 29.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) leave fridge door open
30. 30.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
31. 31.🧾 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?
32. 32.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) switch off empty rooms (d) use LED lamps
33. 33.🧾 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?
34. 34.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
35. 35.True or false: to switch off empty rooms saves electricity. (a) True (b) False
36. 36.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) run fans in empty rooms (d) use daylight to read
39. 39.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
40. 40.True or false: to use old filament bulbs saves electricity. (a) False (b) True

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