Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 468 · 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) close the fridge quickly (b) leave fridge door open (c) use LED lamps (d) use daylight to read
2. 2.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
3. 3.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
4. 4.🧾 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?
5. 5.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
7. 7.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) use LED lamps
9. 9.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
11. 11.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave fridge door open (d) close the fridge quickly
12. 12.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
15. 15.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) iron one shirt at a time
16. 16.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs
17. 17.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
20. 20.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) leave fridge door open (d) iron one shirt at a time
21. 21.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
23. 23.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
24. 24.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) unplug idle chargers (d) switch off empty rooms
25. 25.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
26. 26.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
28. 28.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
29. 29.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) use daylight to read (d) leave the TV on standby
30. 30.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
31. 31.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
37. 37.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) close the fridge quickly
38. 38.🧾 A family uses 80 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) run fans in empty rooms (b) set the AC to 24 °C (c) switch off empty rooms (d) close the fridge quickly
40. 40.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False

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