Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 140 · 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.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use LED lamps (d) set the AC to 24 °C
3. 3.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
5. 5.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) use old filament bulbs (d) run fans in empty rooms
6. 6.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.True or false: to leave the TV on standby saves electricity. (a) True (b) False
11. 11.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
13. 13.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
15. 15.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) use LED lamps
16. 16.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
20. 20.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
21. 21.True or false: to use LED lamps saves electricity. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
24. 24.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to use daylight to read wastes electricity. (a) True (b) False
26. 26.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) use daylight to read
27. 27.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
28. 28.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
29. 29.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
31. 31.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
33. 33.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) close the fridge quickly (d) use old filament bulbs
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use old filament bulbs (d) iron one shirt at a time
39. 39.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
40. 40.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity

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