Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 831 · 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 lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
2. 2.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
3. 3.True or false: to leave fridge door open wastes electricity. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) leave the TV on standby
5. 5.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) unplug idle chargers (d) run fans in empty rooms
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
9. 9.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) run fans in empty rooms (d) close the fridge quickly
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
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 4 hours. How many watt-hours (Wh) are saved?
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave fridge door open
13. 13.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
14. 14.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) switch off empty rooms
15. 15.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) use daylight to read
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
18. 18.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
20. 20.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
21. 21.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
22. 22.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
23. 23.True or false: to unplug idle chargers saves electricity. (a) False (b) True
24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
25. 25.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
26. 26.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
27. 27.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
28. 28.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
29. 29.True or false: to use LED lamps wastes electricity. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) use LED lamps
31. 31.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to close the fridge quickly saves electricity. (a) True (b) False
33. 33.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) use LED lamps (d) switch off empty rooms
35. 35.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
37. 37.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
38. 38.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) close the fridge quickly (d) use daylight to read
39. 39.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
40. 40.True or false: to leave the TV on standby wastes electricity. (a) False (b) True

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