Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 604 · 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.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) leave fridge door open
2. 2.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
3. 3.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
5. 5.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
8. 8.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) run fans in empty rooms (d) iron one shirt at a time
9. 9.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) run fans in empty rooms
10. 10.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
12. 12.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
13. 13.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
14. 14.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
15. 15.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
16. 16.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
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 3 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) unplug idle chargers (d) leave fridge door open
19. 19.🧾 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?
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use old filament bulbs (d) use daylight to read
22. 22.True or false: to leave the TV on standby saves electricity. (a) False (b) True
23. 23.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
24. 24.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
25. 25.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
26. 26.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
27. 27.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) set the AC to 24 °C (d) unplug idle chargers
28. 28.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
30. 30.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
31. 31.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
36. 36.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
37. 37.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to use daylight to read saves electricity. (a) False (b) True
39. 39.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?

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