Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 890 · 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 use daylight to read? (a) saves electricity (b) wastes electricity
2. 2.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
3. 3.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) close the fridge quickly
5. 5.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) switch off empty rooms (d) use daylight to read
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
7. 7.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) use old filament bulbs (d) leave fridge door open
9. 9.True or false: to use daylight to read wastes electricity. (a) True (b) False
10. 10.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
12. 12.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
13. 13.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs
14. 14.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
15. 15.True or false: to leave fridge door open saves electricity. (a) True (b) False
16. 16.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
17. 17.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) use old filament bulbs (d) leave the TV on standby
18. 18.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
19. 19.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
21. 21.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) use daylight to read (d) switch off empty rooms
23. 23.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
24. 24.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) leave fridge door open (d) leave the TV on standby
30. 30.True or false: to close the fridge quickly saves electricity. (a) False (b) True
31. 31.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
33. 33.True or false: to use LED lamps saves electricity. (a) False (b) True
34. 34.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 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?
36. 36.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) use LED lamps
40. 40.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity

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