Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 323 · 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.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
2. 2.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
5. 5.🧾 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?
6. 6.🧾 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?
7. 7.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave fridge door open (d) close the fridge quickly
9. 9.Which of these wastes electricity? (a) run fans in empty rooms (b) use daylight to read (c) switch off empty rooms (d) unplug idle chargers
10. 10.True or false: to close the fridge quickly saves electricity. (a) False (b) True
11. 11.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
14. 14.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
16. 16.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) iron one shirt at a time
18. 18.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.True or false: to use LED lamps saves electricity. (a) False (b) True
20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
21. 21.True or false: to leave the TV on standby saves electricity. (a) False (b) True
22. 22.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
23. 23.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) switch off empty rooms (d) set the AC to 24 °C
24. 24.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
25. 25.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
26. 26.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
27. 27.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
28. 28.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
29. 29.True or false: to use daylight to read saves electricity. (a) False (b) True
30. 30.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) leave the TV on standby (d) use daylight to read
31. 31.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
32. 32.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
34. 34.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.True or false: to use old filament bulbs wastes electricity. (a) True (b) False

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