Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 552 · 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 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
2. 2.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) unplug idle chargers (d) switch off empty rooms
3. 3.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
4. 4.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) leave the TV on standby (d) run fans in empty rooms
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
8. 8.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
12. 12.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
13. 13.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) switch off empty rooms (d) set the AC to 24 °C
14. 14.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
16. 16.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
18. 18.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
19. 19.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
21. 21.True or false: to switch off empty rooms saves electricity. (a) True (b) False
22. 22.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave the TV on standby (d) use old filament bulbs
23. 23.True or false: to close the fridge quickly saves electricity. (a) False (b) True
24. 24.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) leave fridge door open (d) leave the TV on standby
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 5 hours. How many watt-hours (Wh) are saved?
26. 26.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
27. 27.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) close the fridge quickly (d) iron one shirt at a time
29. 29.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) iron one shirt at a time (d) leave fridge door open
30. 30.True or false: to leave the TV on standby saves electricity. (a) False (b) True
31. 31.True or false: to use LED lamps saves electricity. (a) False (b) True
32. 32.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) iron one shirt at a time
34. 34.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
35. 35.🧾 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?
36. 36.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
38. 38.🧾 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?
39. 39.🧾 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?
40. 40.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity

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