Which of the following situations demonstrates a direct energy transfer?

Question

1 when the traffic signal turns red, automobiles stop
2 when waters boiled, steam is produced

3 after field is ploughed and fertilized corn is planted

4When the fire alarm rings fire trucks rush off
5 If a letter as the Correct postage the letter Carrier deliver it

Answer 1

Option 2 demonstrates a direct energy transfer. When water is boiled, thermal energy is transferred to the water molecules, causing them to gain energy and transform into steam.