Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 387 · 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 switch off empty rooms? (a) wastes electricity (b) saves electricity
2. 2.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
3. 3.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
4. 4.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
5. 5.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
7. 7.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
8. 8.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) set the AC to 24 °C (d) leave the TV on standby
9. 9.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
11. 11.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) run fans in empty rooms
12. 12.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) use old filament bulbs
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
14. 14.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
15. 15.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
16. 16.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
17. 17.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
19. 19.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) use old filament bulbs (d) iron one shirt at a time
20. 20.🧾 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?
21. 21.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
23. 23.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
25. 25.True or false: to leave fridge door open wastes electricity. (a) False (b) True
26. 26.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
28. 28.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) use daylight to read (d) set the AC to 24 °C
29. 29.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
31. 31.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) run fans in empty rooms
32. 32.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
36. 36.Which of these wastes electricity? (a) leave fridge door open (b) use LED lamps (c) switch off empty rooms (d) set the AC to 24 °C
37. 37.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) leave fridge door open

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