Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 456 · 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) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
2. 2.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) close the fridge quickly (d) iron one shirt at a time
3. 3.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
4. 4.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
6. 6.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
7. 7.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) use old filament bulbs (d) use daylight to read
8. 8.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
9. 9.True or false: to leave fridge door open wastes electricity. (a) True (b) False
10. 10.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
12. 12.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
13. 13.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to use daylight to read wastes electricity. (a) False (b) True
15. 15.🧾 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?
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) close the fridge quickly (d) use daylight to read
18. 18.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) use old filament bulbs (d) leave the TV on standby
20. 20.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) set the AC to 24 °C (d) run fans in empty rooms
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) leave fridge door open (d) iron one shirt at a time
22. 22.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) set the AC to 24 °C
29. 29.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) set the AC to 24 °C (d) iron one shirt at a time
31. 31.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
32. 32.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to switch off empty rooms saves electricity. (a) False (b) True
34. 34.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
35. 35.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
36. 36.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
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 9 hours. How many watt-hours (Wh) are saved?
38. 38.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave the TV on standby (d) use LED lamps
39. 39.True or false: to use old filament bulbs saves electricity. (a) True (b) False
40. 40.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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