Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 203 · 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) use daylight to read (c) leave fridge door open (d) switch off empty rooms
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
3. 3.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
4. 4.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
5. 5.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
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.True or false: to leave the TV on standby saves electricity. (a) True (b) False
9. 9.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
10. 10.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) use LED lamps (d) set the AC to 24 °C
11. 11.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
12. 12.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
13. 13.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave fridge door open (d) switch off empty rooms
14. 14.True or false: to leave fridge door open saves electricity. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
16. 16.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
18. 18.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
19. 19.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
21. 21.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.True or false: to use LED lamps wastes electricity. (a) True (b) False
23. 23.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
24. 24.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
25. 25.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
29. 29.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
30. 30.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) use old filament bulbs
31. 31.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
32. 32.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
33. 33.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
34. 34.🧾 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?
35. 35.True or false: to use LED lamps saves electricity. (a) False (b) True
36. 36.🧾 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?
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
39. 39.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) unplug idle chargers
40. 40.True or false: to use daylight to read saves electricity. (a) False (b) True

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