Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 565 · 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 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
3. 3.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
4. 4.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
6. 6.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
7. 7.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) iron one shirt at a time
8. 8.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) run fans in empty rooms (d) unplug idle chargers
10. 10.🧾 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
11. 11.True or false: to use daylight to read saves electricity. (a) False (b) True
12. 12.🧾 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?
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) unplug idle chargers (d) leave fridge door open
15. 15.True or false: to switch off empty rooms saves electricity. (a) True (b) False
16. 16.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
18. 18.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
19. 19.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) run fans in empty rooms
21. 21.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
22. 22.True or false: to use LED lamps saves electricity. (a) False (b) True
23. 23.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
25. 25.🧾 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?
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) use daylight to read (d) leave fridge door open
27. 27.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
28. 28.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
29. 29.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) use old filament bulbs
31. 31.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
33. 33.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) set the AC to 24 °C
34. 34.True or false: to use LED lamps wastes electricity. (a) False (b) True
35. 35.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity

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