Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 734 · 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.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
3. 3.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
4. 4.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open
6. 6.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
7. 7.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
9. 9.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) leave the TV on standby (d) use old filament bulbs
11. 11.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use daylight to read (d) close the fridge quickly
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 8 hours. How many watt-hours (Wh) are saved?
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) set the AC to 24 °C (d) use daylight to read
15. 15.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
17. 17.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
18. 18.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
19. 19.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
20. 20.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
21. 21.🧾 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
22. 22.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) iron one shirt at a time (d) leave fridge door open
23. 23.🧾 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?
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) unplug idle chargers
26. 26.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) iron one shirt at a time (d) set the AC to 24 °C
27. 27.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.True or false: to leave the TV on standby saves electricity. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) set the AC to 24 °C
30. 30.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
31. 31.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) switch off empty rooms (d) set the AC to 24 °C
32. 32.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
33. 33.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) run fans in empty rooms (d) iron one shirt at a time
34. 34.True or false: to use LED lamps wastes electricity. (a) True (b) False
35. 35.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
36. 36.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
37. 37.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
38. 38.True or false: to leave fridge door open saves electricity. (a) False (b) True
39. 39.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to switch off empty rooms saves electricity. (a) False (b) True

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