Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 102 · 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.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
2. 2.True or false: to leave the TV on standby saves electricity. (a) False (b) True
3. 3.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
4. 4.True or false: to switch off empty rooms saves electricity. (a) True (b) False
5. 5.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
6. 6.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
7. 7.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) run fans in empty rooms (d) leave fridge door open
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
9. 9.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
10. 10.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use daylight to read (d) iron one shirt at a time
11. 11.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
12. 12.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) switch off empty rooms (d) close the fridge quickly
13. 13.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) iron one shirt at a time (d) leave the TV on standby
16. 16.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
17. 17.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
18. 18.True or false: to unplug idle chargers saves electricity. (a) False (b) True
19. 19.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
21. 21.True or false: to use daylight to read saves electricity. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) use LED lamps
23. 23.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) use old filament bulbs
24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
26. 26.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
27. 27.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
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 8 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
32. 32.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to use old filament bulbs saves electricity. (a) False (b) True
35. 35.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
37. 37.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
39. 39.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity

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