Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 592 · 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) switch off empty rooms (c) unplug idle chargers (d) run fans in empty rooms
2. 2.🧾 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?
3. 3.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) switch off empty rooms (d) close the fridge quickly
4. 4.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) leave fridge door open (d) iron one shirt at a time
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
6. 6.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
7. 7.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) leave the TV on standby (d) use LED lamps
8. 8.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
11. 11.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
12. 12.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
13. 13.🧾 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?
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
15. 15.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) iron one shirt at a time (d) use daylight to read
17. 17.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) unplug idle chargers (d) set the AC to 24 °C
18. 18.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
21. 21.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
25. 25.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
29. 29.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
31. 31.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) close the fridge quickly (d) leave fridge door open
32. 32.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) switch off empty rooms (d) run fans in empty rooms
36. 36.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) use LED lamps
37. 37.🧾 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?
38. 38.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
39. 39.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
40. 40.True or false: to use daylight to read wastes electricity. (a) True (b) False

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