Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 564 · 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.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
2. 2.True or false: to leave the TV on standby saves electricity. (a) True (b) False
3. 3.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
7. 7.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
9. 9.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
10. 10.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
11. 11.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) iron one shirt at a time (d) set the AC to 24 °C
12. 12.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
13. 13.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
14. 14.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
15. 15.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
18. 18.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave fridge door open (d) use LED lamps
20. 20.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
21. 21.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
22. 22.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
24. 24.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
25. 25.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
26. 26.True or false: to use LED lamps wastes electricity. (a) True (b) False
27. 27.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
28. 28.True or false: to use daylight to read saves electricity. (a) True (b) False
29. 29.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
30. 30.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
31. 31.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
33. 33.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
35. 35.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) close the fridge quickly (d) run fans in empty rooms
37. 37.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
38. 38.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) iron one shirt at a time (d) leave fridge door open
39. 39.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) iron one shirt at a time (d) use old filament bulbs
40. 40.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

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