Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 427 · 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.True or false: to leave fridge door open wastes electricity. (a) True (b) False
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) leave fridge door open
3. 3.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) leave the TV on standby
4. 4.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) use LED lamps (d) use daylight to read
5. 5.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
7. 7.🧾 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?
8. 8.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) close the fridge quickly (d) leave the TV on standby
10. 10.🧾 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
11. 11.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
12. 12.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
13. 13.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
14. 14.🧾 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?
15. 15.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) unplug idle chargers (d) leave fridge door open
16. 16.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) use daylight to read (d) use LED lamps
17. 17.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
18. 18.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use daylight to read (d) close the fridge quickly
19. 19.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
20. 20.True or false: to use LED lamps wastes electricity. (a) False (b) True
21. 21.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
24. 24.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
25. 25.True or false: to leave fridge door open saves electricity. (a) False (b) True
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
27. 27.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
28. 28.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) unplug idle chargers (d) use daylight to read
29. 29.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
30. 30.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
31. 31.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) leave the TV on standby (d) use LED lamps
32. 32.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) run fans in empty rooms (d) unplug idle chargers
39. 39.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
40. 40.True or false: to leave the TV on standby saves electricity. (a) False (b) True

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