Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 375 · 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.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
3. 3.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) leave fridge door open (d) use old filament bulbs
5. 5.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
6. 6.🧾 A 50 W appliance runs for 8 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 ₹9. What is the bill (in ₹)?
8. 8.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) iron one shirt at a time (d) leave the TV on standby
9. 9.True or false: to use daylight to read wastes electricity. (a) True (b) False
10. 10.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
11. 11.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
12. 12.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
14. 14.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) use daylight to read
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) use LED lamps (d) set the AC to 24 °C
16. 16.True or false: to leave fridge door open saves electricity. (a) True (b) False
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
18. 18.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) iron one shirt at a time
19. 19.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
21. 21.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
22. 22.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
23. 23.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
25. 25.True or false: to use daylight to read saves electricity. (a) True (b) False
26. 26.True or false: to switch off empty rooms saves electricity. (a) False (b) True
27. 27.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
28. 28.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
29. 29.🧾 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?
30. 30.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
31. 31.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) unplug idle chargers (d) leave fridge door open
32. 32.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
34. 34.🧾 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?
35. 35.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.True or false: to close the fridge quickly saves electricity. (a) True (b) False
37. 37.True or false: to use LED lamps saves electricity. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) unplug idle chargers
39. 39.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to leave fridge door open wastes electricity. (a) True (b) False

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