Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 908 · 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 the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
2. 2.True or false: to unplug idle chargers saves electricity. (a) False (b) True
3. 3.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) switch off empty rooms
5. 5.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) iron one shirt at a time
6. 6.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
7. 7.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
13. 13.True or false: to use LED lamps wastes electricity. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) run fans in empty rooms (d) use LED lamps
15. 15.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
16. 16.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
18. 18.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
21. 21.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
22. 22.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
23. 23.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) set the AC to 24 °C (d) use old filament bulbs
26. 26.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
27. 27.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
28. 28.🧾 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?
29. 29.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) switch off empty rooms (d) unplug idle chargers
30. 30.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) set the AC to 24 °C (d) close the fridge quickly
31. 31.True or false: to switch off empty rooms saves electricity. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
33. 33.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to leave the TV on standby saves electricity. (a) True (b) False
35. 35.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
36. 36.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
39. 39.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
40. 40.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity

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