Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 496 · 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 is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
2. 2.True or false: to use LED lamps wastes electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
4. 4.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
5. 5.🧾 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?
6. 6.True or false: to use daylight to read saves electricity. (a) False (b) True
7. 7.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) switch off empty rooms
8. 8.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
9. 9.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) use daylight to read
11. 11.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
13. 13.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
14. 14.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
15. 15.🧾 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?
16. 16.🧾 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?
17. 17.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
19. 19.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
21. 21.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) use LED lamps (d) unplug idle chargers
23. 23.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
24. 24.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
25. 25.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
31. 31.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
33. 33.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
35. 35.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave fridge door open (d) unplug idle chargers
36. 36.True or false: to leave fridge door open wastes electricity. (a) False (b) True
37. 37.🧾 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?
38. 38.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) use daylight to read (d) switch off empty rooms
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 7 hours. How many watt-hours (Wh) are saved?
40. 40.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity

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