Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 581 · 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 ₹5. What is the bill (in ₹)?
2. 2.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
3. 3.🧾 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
4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) use old filament bulbs (d) iron one shirt at a time
5. 5.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
7. 7.True or false: to use daylight to read wastes electricity. (a) False (b) True
8. 8.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
9. 9.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) use LED lamps (d) use daylight to read
10. 10.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
11. 11.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
13. 13.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
14. 14.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) close the fridge quickly (d) leave the TV on standby
15. 15.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) leave fridge door open
18. 18.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) iron one shirt at a time
19. 19.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
20. 20.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) leave fridge door open
21. 21.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
23. 23.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) use daylight to read (d) use LED lamps
25. 25.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 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?
27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
28. 28.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
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 3 hours. How many watt-hours (Wh) are saved?
31. 31.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
32. 32.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) use old filament bulbs (d) switch off empty rooms
33. 33.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
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 3 hours. How many watt-hours (Wh) are saved?
35. 35.True or false: to unplug idle chargers saves electricity. (a) True (b) False
36. 36.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
38. 38.True or false: to switch off empty rooms saves electricity. (a) True (b) False
39. 39.True or false: to leave fridge door open wastes electricity. (a) True (b) False
40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity

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