Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 826 · 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.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
2. 2.True or false: to switch off empty rooms saves electricity. (a) True (b) False
3. 3.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
6. 6.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
7. 7.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
8. 8.🧾 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?
9. 9.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) set the AC to 24 °C (d) run fans in empty rooms
10. 10.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
12. 12.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) close the fridge quickly (d) leave the TV on standby
13. 13.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
16. 16.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) run fans in empty rooms (d) iron one shirt at a time
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
20. 20.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
21. 21.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
22. 22.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
23. 23.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use daylight to read (d) switch off empty rooms
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 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?
28. 28.True or false: to use LED lamps saves electricity. (a) True (b) False
29. 29.Which of these wastes electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) use LED lamps
30. 30.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) unplug idle chargers
32. 32.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
33. 33.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) unplug idle chargers (d) set the AC to 24 °C
35. 35.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time

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