Read the following case and answer the following questions:
A student fully charges a mobile phone overnight. During the day, the phone is used for making calls, watching videos, listening to music, and playing games. As the battery level gradually decreases, the student notices that the phone becomes slightly warm while charging and also after playing games for a long time. The phone's screen produces light, the speaker produces sound, and the battery stores energy that powers all these activities.
The science teacher explains that a mobile phone is an excellent example of how energy changes from one form to another in everyday life.
The science teacher explains that a mobile phone is an excellent example of how energy changes from one form to another in everyday life.
1. During charging, electrical energy is mainly converted into which form of energy inside the battery?
2. When listening to music through the phone's speaker, which energy transformation mainly occurs?