Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 739 · 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) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) unplug idle chargers
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
3. 3.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
4. 4.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
5. 5.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
7. 7.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) unplug idle chargers
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
9. 9.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) set the AC to 24 °C
11. 11.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
13. 13.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) switch off empty rooms (d) leave the TV on standby
14. 14.🧾 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
15. 15.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) run fans in empty rooms (d) set the AC to 24 °C
16. 16.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) unplug idle chargers (d) run fans in empty rooms
18. 18.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
19. 19.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
20. 20.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
22. 22.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
23. 23.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) iron one shirt at a time
25. 25.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
26. 26.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) unplug idle chargers (d) close the fridge quickly
27. 27.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
28. 28.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) use LED lamps
29. 29.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) use daylight to read (d) unplug idle chargers
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 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?
33. 33.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
34. 34.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
35. 35.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) use daylight to read
39. 39.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
40. 40.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity

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