Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 41 · 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 wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) use daylight to read (d) set the AC to 24 °C
2. 2.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) use daylight to read (d) unplug idle chargers
3. 3.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
4. 4.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
5. 5.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
6. 6.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
8. 8.True or false: to switch off empty rooms saves electricity. (a) False (b) True
9. 9.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) use daylight to read (d) switch off empty rooms
10. 10.🧾 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
11. 11.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
13. 13.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) use old filament bulbs
14. 14.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) set the AC to 24 °C
15. 15.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) unplug idle chargers (d) use old filament bulbs
16. 16.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) set the AC to 24 °C (d) close the fridge quickly
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
19. 19.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
21. 21.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
22. 22.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) run fans in empty rooms (d) use LED lamps
23. 23.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
24. 24.True or false: to use daylight to read wastes electricity. (a) True (b) False
25. 25.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
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 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
31. 31.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
32. 32.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
33. 33.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
35. 35.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
40. 40.True or false: to use old filament bulbs saves electricity. (a) False (b) True

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