Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 751 · 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.🧾 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?
2. 2.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use daylight to read (d) leave the TV on standby
3. 3.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use old filament bulbs (d) close the fridge quickly
4. 4.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
5. 5.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
6. 6.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
8. 8.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
10. 10.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
11. 11.True or false: to leave the TV on standby saves electricity. (a) True (b) False
12. 12.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
13. 13.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.True or false: to leave fridge door open wastes electricity. (a) False (b) True
15. 15.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
16. 16.True or false: to use LED lamps wastes electricity. (a) False (b) True
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
21. 21.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) unplug idle chargers (d) use LED lamps
22. 22.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
23. 23.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
26. 26.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
28. 28.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
29. 29.True or false: to unplug idle chargers saves electricity. (a) False (b) True
30. 30.True or false: to switch off empty rooms saves electricity. (a) True (b) False
31. 31.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) set the AC to 24 °C (d) run fans in empty rooms
33. 33.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) run fans in empty rooms
34. 34.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
35. 35.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
36. 36.True or false: to use daylight to read saves electricity. (a) True (b) False
37. 37.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) set the AC to 24 °C
39. 39.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) use LED lamps
40. 40.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False

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