Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 371 · 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 saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) switch off empty rooms (d) use old filament bulbs
2. 2.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
4. 4.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
5. 5.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 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?
8. 8.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) use daylight to read (d) close the fridge quickly
9. 9.True or false: to use LED lamps saves electricity. (a) True (b) False
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
12. 12.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) unplug idle chargers (d) iron one shirt at a time
14. 14.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
15. 15.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
16. 16.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
17. 17.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) set the AC to 24 °C
18. 18.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) iron one shirt at a time
20. 20.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
21. 21.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) use old filament bulbs (d) run fans in empty rooms
24. 24.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.True or false: to unplug idle chargers saves electricity. (a) False (b) True
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
27. 27.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
31. 31.True or false: to leave fridge door open saves electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) unplug idle chargers (d) leave the TV on standby
35. 35.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) switch off empty rooms (d) use daylight to read
36. 36.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
37. 37.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
39. 39.True or false: to leave fridge door open wastes electricity. (a) False (b) True
40. 40.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) use daylight to read (d) run fans in empty rooms

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