Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 489 · 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.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
3. 3.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
4. 4.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) set the AC to 24 °C
5. 5.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) run fans in empty rooms (d) use LED lamps
6. 6.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
7. 7.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) iron one shirt at a time
8. 8.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use LED lamps (d) leave the TV on standby
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
11. 11.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) use LED lamps
13. 13.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
15. 15.True or false: to use daylight to read wastes electricity. (a) False (b) True
16. 16.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
17. 17.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
18. 18.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
19. 19.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) leave fridge door open
22. 22.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
25. 25.🧾 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?
26. 26.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) use old filament bulbs (d) iron one shirt at a time
27. 27.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) use old filament bulbs
28. 28.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use daylight to read (d) unplug idle chargers
30. 30.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
33. 33.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) use LED lamps
35. 35.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
37. 37.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
38. 38.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) run fans in empty rooms
40. 40.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere

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