Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 482 · 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 is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) use LED lamps
2. 2.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) close the fridge quickly (d) use daylight to read
3. 3.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 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?
6. 6.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
7. 7.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
8. 8.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
9. 9.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
10. 10.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 LED lamps
11. 11.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
12. 12.True or false: to unplug idle chargers saves electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
14. 14.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
15. 15.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
16. 16.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
17. 17.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) leave fridge door open
20. 20.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) set the AC to 24 °C (d) run fans in empty rooms
21. 21.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
22. 22.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
23. 23.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use daylight to read (d) leave fridge door open
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 2 hours. How many watt-hours (Wh) are saved?
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
26. 26.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
27. 27.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) set the AC to 24 °C (d) use LED lamps
29. 29.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.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
31. 31.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) set the AC to 24 °C (d) use LED lamps
32. 32.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
33. 33.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
36. 36.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
37. 37.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
38. 38.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) use LED lamps

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