Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 512 · 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 saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
3. 3.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) use daylight to read (d) use old filament bulbs
4. 4.🧾 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?
5. 5.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
8. 8.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use LED lamps (d) leave fridge door open
9. 9.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
10. 10.True or false: to switch off empty rooms saves electricity. (a) False (b) True
11. 11.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) set the AC to 24 °C (d) unplug idle chargers
13. 13.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave the TV on standby
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
15. 15.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
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 6 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
19. 19.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
20. 20.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave the TV on standby (d) use daylight to read
21. 21.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
22. 22.True or false: to use daylight to read saves electricity. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
24. 24.True or false: to leave the TV on standby saves electricity. (a) False (b) True
25. 25.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
26. 26.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) close the fridge quickly (d) iron one shirt at a time
27. 27.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) unplug idle chargers
28. 28.True or false: to leave fridge door open wastes electricity. (a) True (b) False
29. 29.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
30. 30.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
31. 31.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
33. 33.True or false: to use daylight to read wastes electricity. (a) True (b) False
34. 34.True or false: to use old filament bulbs saves electricity. (a) False (b) True
35. 35.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) switch off empty rooms (d) iron one shirt at a time
37. 37.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) use old filament bulbs (d) use daylight to read
38. 38.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
39. 39.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity

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