Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 772 · 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.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
2. 2.True or false: to close the fridge quickly saves electricity. (a) True (b) False
3. 3.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
5. 5.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
6. 6.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
7. 7.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) use old filament bulbs (d) use LED lamps
8. 8.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
9. 9.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
10. 10.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) unplug idle chargers (d) leave the TV on standby
11. 11.🧾 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?
12. 12.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) leave fridge door open
15. 15.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) unplug idle chargers (d) use daylight to read
16. 16.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
17. 17.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
18. 18.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
19. 19.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
20. 20.True or false: to use daylight to read wastes electricity. (a) True (b) False
21. 21.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
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 3 hours. How many watt-hours (Wh) are saved?
23. 23.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) iron one shirt at a time
24. 24.🧾 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?
25. 25.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
27. 27.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
28. 28.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
29. 29.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) use old filament bulbs (d) use LED lamps
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to use LED lamps saves electricity. (a) True (b) False
32. 32.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
35. 35.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
36. 36.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
37. 37.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) use LED lamps (d) unplug idle chargers
39. 39.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
40. 40.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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