Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 138 · 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 is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
2. 2.True or false: to use LED lamps wastes electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
4. 4.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave fridge door open (d) leave the TV on standby
5. 5.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) iron one shirt at a time (d) switch off empty rooms
9. 9.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
10. 10.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
11. 11.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) unplug idle chargers (d) leave the TV on standby
12. 12.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
14. 14.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) use old filament bulbs (d) unplug idle chargers
15. 15.🧾 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?
16. 16.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
20. 20.True or false: to close the fridge quickly saves electricity. (a) True (b) False
21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
22. 22.🧾 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?
23. 23.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) leave fridge door open (d) switch off empty rooms
24. 24.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
26. 26.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
27. 27.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) leave fridge door open (d) leave the TV on standby
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) close the fridge quickly (d) use LED lamps
29. 29.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) switch off empty rooms (d) leave fridge door open
30. 30.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
31. 31.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) leave fridge door open (d) run fans in empty rooms
33. 33.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
34. 34.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
35. 35.True or false: to leave fridge door open saves electricity. (a) False (b) True
36. 36.🧾 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?
37. 37.True or false: to leave the TV on standby saves electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) iron one shirt at a time (d) leave the TV on standby
39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
40. 40.True or false: to use LED lamps saves electricity. (a) False (b) True

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