Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 763 · 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.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
2. 2.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) unplug idle chargers (d) use daylight to read
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
4. 4.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) close the fridge quickly (d) switch off empty rooms
5. 5.True or false: to use LED lamps wastes electricity. (a) False (b) True
6. 6.True or false: to leave fridge door open saves electricity. (a) False (b) True
7. 7.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
8. 8.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
9. 9.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) unplug idle chargers
11. 11.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
13. 13.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
14. 14.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
15. 15.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave fridge door open (d) use daylight to read
16. 16.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
17. 17.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave fridge door open (d) leave the TV on standby
19. 19.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
20. 20.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) run fans in empty rooms (d) leave fridge door open
21. 21.True or false: to leave the TV on standby saves electricity. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) iron one shirt at a time (d) use old filament bulbs
23. 23.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
25. 25.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) use daylight to read
26. 26.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
27. 27.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) switch off empty rooms (d) use old filament bulbs
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
29. 29.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
30. 30.True or false: to use LED lamps saves electricity. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use old filament bulbs (d) iron one shirt at a time
32. 32.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
36. 36.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) run fans in empty rooms (d) unplug idle chargers
39. 39.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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