Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 44 · 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.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
2. 2.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) unplug idle chargers (d) use daylight to read
5. 5.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
6. 6.True or false: to close the fridge quickly saves electricity. (a) False (b) True
7. 7.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read
8. 8.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
9. 9.True or false: to use daylight to read saves electricity. (a) False (b) True
10. 10.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) close the fridge quickly (d) set the AC to 24 °C
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use LED lamps (d) switch off empty rooms
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 2 hours. How many watt-hours (Wh) are saved?
13. 13.🧾 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?
14. 14.True or false: to leave fridge door open wastes electricity. (a) False (b) True
15. 15.🧾 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?
16. 16.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
18. 18.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) use old filament bulbs (d) close the fridge quickly
21. 21.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
22. 22.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
23. 23.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use LED lamps (d) iron one shirt at a time
24. 24.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
27. 27.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
28. 28.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) use LED lamps (d) leave fridge door open
29. 29.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
30. 30.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) use LED lamps (d) set the AC to 24 °C
32. 32.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
33. 33.True or false: to leave the TV on standby saves electricity. (a) True (b) False
34. 34.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
35. 35.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) use old filament bulbs
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) set the AC to 24 °C
37. 37.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
38. 38.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use old filament bulbs (d) switch off empty rooms

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