Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 931 · 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) iron one shirt at a time (b) use LED lamps (c) set the AC to 24 °C (d) close the fridge quickly
2. 2.🧾 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?
3. 3.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
5. 5.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
7. 7.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
8. 8.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to switch off empty rooms saves electricity. (a) False (b) True
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
12. 12.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
15. 15.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
16. 16.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) use old filament bulbs (d) use LED lamps
17. 17.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
18. 18.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
19. 19.🧾 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
20. 20.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
21. 21.True or false: to use daylight to read wastes electricity. (a) True (b) False
22. 22.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
24. 24.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
25. 25.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) leave the TV on standby
27. 27.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) use LED lamps
30. 30.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) use daylight to read (d) iron one shirt at a time
31. 31.🧾 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?
32. 32.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
33. 33.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) run fans in empty rooms (d) use old filament bulbs
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
36. 36.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) run fans in empty rooms (d) iron one shirt at a time
38. 38.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) leave fridge door open
40. 40.True or false: to use LED lamps wastes electricity. (a) True (b) False

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