Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 777 · 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 is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
2. 2.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
4. 4.🧾 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?
5. 5.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
6. 6.True or false: to use daylight to read saves electricity. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
9. 9.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) set the AC to 24 °C (d) unplug idle chargers
10. 10.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) iron one shirt at a time
11. 11.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave the TV on standby (d) close the fridge quickly
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
16. 16.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
18. 18.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
20. 20.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) unplug idle chargers
21. 21.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
22. 22.True or false: to close the fridge quickly saves electricity. (a) True (b) False
23. 23.True or false: to use daylight to read wastes electricity. (a) True (b) False
24. 24.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave the TV on standby (d) run fans in empty rooms
25. 25.🧾 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
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
28. 28.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.True or false: to unplug idle chargers saves electricity. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) switch off empty rooms (d) use old filament bulbs
35. 35.🔍 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
36. 36.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
37. 37.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use daylight to read (d) run fans in empty rooms
38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
39. 39.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
40. 40.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity

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