Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 70 · 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 use LED lamps? (a) saves electricity (b) wastes electricity
2. 2.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) use daylight to read
3. 3.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) leave the TV on standby (d) close the fridge quickly
5. 5.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) unplug idle chargers (d) set the AC to 24 °C
6. 6.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) unplug idle chargers (d) use daylight to read
7. 7.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
9. 9.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) leave fridge door open (d) use LED lamps
11. 11.True or false: to use daylight to read wastes electricity. (a) True (b) False
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
13. 13.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
14. 14.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
15. 15.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
16. 16.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to use LED lamps wastes electricity. (a) True (b) False
21. 21.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
22. 22.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) switch off empty rooms (d) use daylight to read
23. 23.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) set the AC to 24 °C (d) switch off empty rooms
24. 24.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
25. 25.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
26. 26.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) switch off empty rooms (d) use LED lamps
34. 34.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) run fans in empty rooms
35. 35.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
36. 36.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.True or false: to use LED lamps saves electricity. (a) False (b) True
39. 39.True or false: to switch off empty rooms saves electricity. (a) True (b) False
40. 40.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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