Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 191 · 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 of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) close the fridge quickly (d) use LED lamps
2. 2.True or false: to leave fridge door open saves electricity. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) iron one shirt at a time (d) run fans in empty rooms
4. 4.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use LED lamps (d) leave fridge door open
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
11. 11.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) use daylight to read (d) set the AC to 24 °C
13. 13.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
15. 15.True or false: to use LED lamps wastes electricity. (a) True (b) False
16. 16.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use daylight to read (d) close the fridge quickly
18. 18.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
21. 21.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
22. 22.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
24. 24.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
25. 25.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) close the fridge quickly (d) iron one shirt at a time
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
27. 27.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
30. 30.🧾 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?
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
32. 32.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) set the AC to 24 °C
34. 34.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to leave fridge door open wastes electricity. (a) True (b) False
37. 37.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
38. 38.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.True or false: to switch off empty rooms saves electricity. (a) True (b) False
40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity

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