Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 813 · 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 fridge door open (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
2. 2.True or false: to leave fridge door open wastes electricity. (a) False (b) True
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 7 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
5. 5.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
6. 6.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
7. 7.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) iron one shirt at a time (d) use LED lamps
8. 8.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
9. 9.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
10. 10.🧾 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?
11. 11.True or false: to switch off empty rooms saves electricity. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) use old filament bulbs (d) close the fridge quickly
13. 13.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
14. 14.True or false: to leave the TV on standby saves electricity. (a) True (b) False
15. 15.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use LED lamps (d) use daylight to read
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) switch off empty rooms
17. 17.True or false: to use LED lamps wastes electricity. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) unplug idle chargers (d) run fans in empty rooms
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
21. 21.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) set the AC to 24 °C (d) unplug idle chargers
22. 22.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) close the fridge quickly (d) use daylight to read
23. 23.🧾 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?
24. 24.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
26. 26.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to use daylight to read saves electricity. (a) False (b) True
28. 28.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
29. 29.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) iron one shirt at a time
30. 30.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
33. 33.True or false: to unplug idle chargers saves electricity. (a) True (b) False
34. 34.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
35. 35.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
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 3 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) switch off empty rooms (d) close the fridge quickly
39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity

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