Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 901 · 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 lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
2. 2.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) leave the TV on standby
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
5. 5.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
7. 7.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave fridge door open
8. 8.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) set the AC to 24 °C
10. 10.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
11. 11.🧾 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?
12. 12.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
14. 14.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) leave fridge door open (d) use old filament bulbs
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
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 9 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) switch off empty rooms (d) leave the TV on standby
19. 19.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) run fans in empty rooms (d) set the AC to 24 °C
20. 20.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) use daylight to read (d) switch off empty rooms
21. 21.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) set the AC to 24 °C (d) leave fridge door open
23. 23.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
24. 24.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
28. 28.True or false: to leave the TV on standby saves electricity. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) set the AC to 24 °C (d) unplug idle chargers
30. 30.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
35. 35.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) run fans in empty rooms (d) leave the TV on standby
36. 36.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
37. 37.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
39. 39.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
40. 40.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False

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