Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 314 · 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) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
2. 2.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
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) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
5. 5.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
7. 7.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
8. 8.🧾 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?
9. 9.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
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 9 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.🔍 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) close the fridge quickly
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
15. 15.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) iron one shirt at a time
17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
18. 18.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
19. 19.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
20. 20.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) close the fridge quickly (d) leave fridge door open
22. 22.Which of these wastes electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use LED lamps (d) use daylight to read
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
24. 24.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
25. 25.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
27. 27.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
30. 30.True or false: to leave fridge door open wastes electricity. (a) False (b) True
31. 31.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
33. 33.🧾 A 200 W appliance runs for 8 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 is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) run fans in empty rooms (d) use LED lamps
36. 36.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
37. 37.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

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