Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 383 · 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 family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
3. 3.True or false: to use daylight to read wastes electricity. (a) True (b) False
4. 4.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) use daylight to read (d) set the AC to 24 °C
6. 6.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
7. 7.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use old filament bulbs (d) use LED lamps
8. 8.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
9. 9.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
10. 10.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
11. 11.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
12. 12.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
13. 13.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
15. 15.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
16. 16.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
18. 18.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use daylight to read (d) leave fridge door open
19. 19.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) switch off empty rooms (d) use daylight to read
20. 20.🧾 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?
21. 21.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
22. 22.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to leave the TV on standby saves electricity. (a) False (b) True
24. 24.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.True or false: to use old filament bulbs saves electricity. (a) True (b) False
26. 26.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use LED lamps (d) leave fridge door open
28. 28.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.True or false: to use LED lamps wastes electricity. (a) False (b) True
30. 30.🧾 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?
31. 31.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
33. 33.True or false: to leave fridge door open saves electricity. (a) False (b) True
34. 34.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
36. 36.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) leave the TV on standby
37. 37.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
38. 38.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) unplug idle chargers
39. 39.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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