Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 780 · 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) set the AC to 24 °C (b) unplug idle chargers (c) use daylight to read (d) use old filament bulbs
2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) switch off empty rooms (d) close the fridge quickly
4. 4.True or false: to use daylight to read saves electricity. (a) False (b) True
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
6. 6.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
8. 8.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
11. 11.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
13. 13.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use LED lamps (d) leave the TV on standby
14. 14.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
16. 16.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) set the AC to 24 °C (d) switch off empty rooms
17. 17.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
18. 18.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) unplug idle chargers (d) run fans in empty rooms
20. 20.True or false: to leave fridge door open wastes electricity. (a) False (b) True
21. 21.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
22. 22.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
23. 23.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to switch off empty rooms saves electricity. (a) False (b) True
26. 26.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) close the fridge quickly (d) use LED lamps
28. 28.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
29. 29.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
30. 30.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
32. 32.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) close the fridge quickly
36. 36.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) run fans in empty rooms
39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) leave the TV on standby
40. 40.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) iron one shirt at a time (d) run fans in empty rooms

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