Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 695 · 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 lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
2. 2.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use daylight to read (d) unplug idle chargers
3. 3.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
4. 4.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
5. 5.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
8. 8.🧾 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?
9. 9.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 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?
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
12. 12.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use old filament bulbs (d) use daylight to read
13. 13.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) run fans in empty rooms
15. 15.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) switch off empty rooms (d) unplug idle chargers
16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open
17. 17.True or false: to use daylight to read wastes electricity. (a) True (b) False
18. 18.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) set the AC to 24 °C (d) unplug idle chargers
20. 20.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) unplug idle chargers (d) use LED lamps
21. 21.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) leave fridge door open (d) iron one shirt at a time
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
24. 24.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
25. 25.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) use daylight to read (d) set the AC to 24 °C
26. 26.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
30. 30.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) leave fridge door open (d) use daylight to read
31. 31.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
33. 33.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
37. 37.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
39. 39.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
40. 40.True or false: to use LED lamps wastes electricity. (a) True (b) False

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