Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 231 · 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 switch off empty rooms? (a) wastes electricity (b) saves electricity
2. 2.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
3. 3.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) set the AC to 24 °C (d) unplug idle chargers
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) switch off empty rooms (d) use LED lamps
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
6. 6.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
9. 9.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
11. 11.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
14. 14.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
15. 15.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
17. 17.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) iron one shirt at a time
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) set the AC to 24 °C
22. 22.True or false: to leave fridge door open saves electricity. (a) False (b) True
23. 23.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use daylight to read
25. 25.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
26. 26.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
28. 28.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) use LED lamps (d) leave the TV on standby
29. 29.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) switch off empty rooms
31. 31.True or false: to close the fridge quickly saves electricity. (a) False (b) True
32. 32.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) iron one shirt at a time (d) use old filament bulbs
33. 33.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
37. 37.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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