Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 308 · 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) saves electricity (b) wastes electricity
2. 2.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
4. 4.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) unplug idle chargers (d) leave the TV on standby
5. 5.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
6. 6.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
7. 7.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
8. 8.🧾 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?
9. 9.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
11. 11.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
13. 13.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) leave fridge door open (d) iron one shirt at a time
14. 14.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
17. 17.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
18. 18.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use LED lamps (d) run fans in empty rooms
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to unplug idle chargers saves electricity. (a) False (b) True
23. 23.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
25. 25.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) unplug idle chargers (d) use LED lamps
27. 27.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) close the fridge quickly
28. 28.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
29. 29.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
32. 32.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) use daylight to read (d) close the fridge quickly
34. 34.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
35. 35.🧾 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?
36. 36.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
37. 37.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) unplug idle chargers (d) iron one shirt at a time
38. 38.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) set the AC to 24 °C (d) run fans in empty rooms
39. 39.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.True or false: to run fans in empty rooms saves electricity. (a) False (b) True

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