Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 368 · 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 iron one shirt at a time? (a) wastes electricity (b) saves electricity
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
3. 3.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
4. 4.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
5. 5.True or false: to close the fridge quickly saves electricity. (a) False (b) True
6. 6.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
7. 7.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) switch off empty rooms (d) unplug idle chargers
8. 8.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
10. 10.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
12. 12.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
13. 13.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) run fans in empty rooms
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) iron one shirt at a time
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
18. 18.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
19. 19.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.🧾 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?
21. 21.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) use LED lamps (d) unplug idle chargers
22. 22.🧾 A family uses 60 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 use daylight to read? (a) wastes electricity (b) saves electricity
24. 24.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) unplug idle chargers (d) switch off empty rooms
28. 28.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
30. 30.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.Which of these wastes electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) use daylight to read (d) close the fridge quickly
32. 32.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
33. 33.🧾 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?
34. 34.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
36. 36.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
37. 37.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C
38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
39. 39.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.True or false: to use LED lamps wastes electricity. (a) True (b) False

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