Is a thin needle hotter and creates a larger heating pattern than a large diameter needle at the same current setting?

Using a thin needle in electrolysis does indeed result in a hotter tip compared to a larger diameter needle when the same current setting is applied. This phenomenon occurs because the heat generated during electrolysis is concentrated in a smaller area with a thin needle. As the current flows through the needle, resistance increases due to the reduced diameter. When resistance is higher, the energy from the electrical current is transformed into heat more effectively, resulting in a hotter needle.

In contrast, a larger diameter needle has a greater surface area, which allows the heat generated to dissipate more easily and results in a less concentrated heating pattern. Thus, while the larger diameter may conduct the same amount of current, its ability to concentrate heat reduces, leading to a cooler operating temperature at the same settings.

This principle highlights the importance of needle size in electrolysis treatments, affecting both the efficiency and effectiveness of hair removal processes.