Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 996 · 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 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?
2. 2.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) run fans in empty rooms
5. 5.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) set the AC to 24 °C (d) run fans in empty rooms
6. 6.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.🧾 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?
8. 8.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
9. 9.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
10. 10.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
11. 11.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) use daylight to read (d) unplug idle chargers
13. 13.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use old filament bulbs (d) use LED lamps
14. 14.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) unplug idle chargers (d) leave fridge door open
15. 15.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) unplug idle chargers (d) use daylight to read
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) leave fridge door open (d) leave the TV on standby
17. 17.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
18. 18.🧾 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
19. 19.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
20. 20.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
21. 21.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
22. 22.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
23. 23.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
25. 25.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
27. 27.True or false: to use old filament bulbs saves electricity. (a) False (b) True
28. 28.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
30. 30.True or false: to leave fridge door open wastes electricity. (a) True (b) False
31. 31.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 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?
35. 35.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) iron one shirt at a time (d) set the AC to 24 °C
36. 36.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
37. 37.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
38. 38.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
39. 39.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) unplug idle chargers
40. 40.🧾 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?

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