Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 172 · 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 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
2. 2.True or false: to switch off empty rooms saves electricity. (a) True (b) False
3. 3.🧾 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?
4. 4.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
5. 5.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
6. 6.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
8. 8.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) leave the TV on standby (d) unplug idle chargers
9. 9.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
11. 11.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
12. 12.True or false: to unplug idle chargers saves electricity. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) use old filament bulbs (d) switch off empty rooms
14. 14.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) switch off empty rooms
15. 15.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) run fans in empty rooms
16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) set the AC to 24 °C (d) leave the TV on standby
17. 17.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) close the fridge quickly
19. 19.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
21. 21.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
22. 22.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
23. 23.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
24. 24.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) use daylight to read
25. 25.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) use daylight to read (d) unplug idle chargers
26. 26.🧾 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?
27. 27.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
28. 28.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) run fans in empty rooms (d) leave fridge door open
29. 29.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to leave fridge door open wastes electricity. (a) False (b) True
31. 31.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
32. 32.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) use old filament bulbs (d) iron one shirt at a time
35. 35.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
36. 36.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) run fans in empty rooms (d) use LED lamps
37. 37.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) iron one shirt at a time (d) leave fridge door open
39. 39.True or false: to use LED lamps wastes electricity. (a) True (b) False
40. 40.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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