Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 436 · 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) switch off empty rooms (b) use LED lamps (c) use old filament bulbs (d) set the AC to 24 °C
2. 2.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) iron one shirt at a time (d) leave the TV on standby
3. 3.🧾 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?
4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) run fans in empty rooms (d) use old filament bulbs
5. 5.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
6. 6.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
7. 7.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
9. 9.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) switch off empty rooms (d) run fans in empty rooms
10. 10.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
11. 11.True or false: to unplug idle chargers saves electricity. (a) False (b) True
12. 12.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
13. 13.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) set the AC to 24 °C (d) leave the TV on standby
14. 14.True or false: to use LED lamps wastes electricity. (a) True (b) False
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) run fans in empty rooms
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
17. 17.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) iron one shirt at a time
18. 18.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
19. 19.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
20. 20.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
22. 22.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
23. 23.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
24. 24.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
25. 25.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
27. 27.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) set the AC to 24 °C
31. 31.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) switch off empty rooms (d) set the AC to 24 °C
33. 33.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) set the AC to 24 °C
34. 34.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
36. 36.True or false: to use daylight to read wastes electricity. (a) False (b) True
37. 37.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
39. 39.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
40. 40.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs

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