How is current in hearing aids measured?

Current in electrical circuits, including those in hearing aids, is measured using Ohm's law, which states that current (I) is equal to voltage (V) divided by resistance (R). This relationship helps understand how much current flows through a circuit based on the voltage applied and the resistance present.

In the context of hearing aids, this measurement is critical for ensuring that the devices operate within their designed electrical parameters, allowing them to amplify sound effectively without distortion or damage. By gauging the current, dispensers can assess how well the hearing aid functions and whether it meets the user's needs.

The other options do not describe the correct method for calculating current using the relationships defined by Ohm's law, as they either incorrectly represent how voltage, resistance, or other elements relate to current flow. Thus, the correct approach emphasizes the division of voltage by resistance as the means for determining current in hearing aids.