Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 820 · 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 of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use daylight to read (d) leave the TV on standby
2. 2.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
3. 3.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
5. 5.🧾 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
6. 6.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
7. 7.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
8. 8.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.True or false: to use LED lamps saves electricity. (a) True (b) False
10. 10.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
11. 11.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) set the AC to 24 °C
14. 14.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) unplug idle chargers (d) use old filament bulbs
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
16. 16.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
19. 19.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
21. 21.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
22. 22.🧾 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?
23. 23.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) run fans in empty rooms (d) leave fridge door open
24. 24.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
25. 25.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
27. 27.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
33. 33.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
34. 34.True or false: to leave fridge door open wastes electricity. (a) False (b) True
35. 35.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) unplug idle chargers (d) leave fridge door open
36. 36.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) leave fridge door open
37. 37.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
39. 39.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) switch off empty rooms (d) use LED lamps

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