Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 939 · 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) leave fridge door open (b) leave the TV on standby (c) use daylight to read (d) use old filament bulbs
2. 2.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
3. 3.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
4. 4.Which of these wastes electricity? (a) run fans in empty rooms (b) use daylight to read (c) unplug idle chargers (d) switch off empty rooms
5. 5.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) iron one shirt at a time (d) unplug idle chargers
7. 7.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
8. 8.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to leave fridge door open wastes electricity. (a) False (b) True
11. 11.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
12. 12.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) use LED lamps
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
16. 16.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) use LED lamps
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
20. 20.True or false: to unplug idle chargers saves electricity. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) switch off empty rooms (d) use LED lamps
22. 22.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) set the AC to 24 °C
24. 24.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) use old filament bulbs (d) use daylight to read
27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) close the fridge quickly (d) leave fridge door open
28. 28.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) use daylight to read (d) close the fridge quickly
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 8 hours. How many watt-hours (Wh) are saved?
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) unplug idle chargers
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 4 hours. How many watt-hours (Wh) are saved?
33. 33.True or false: to use LED lamps saves electricity. (a) True (b) False
34. 34.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
35. 35.True or false: to use LED lamps wastes electricity. (a) True (b) False
36. 36.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) set the AC to 24 °C
37. 37.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
38. 38.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
39. 39.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

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