Thermal Load

How much heat a coil produces while it runs. It decides whether the accessory needs cooling and how long a session can run. A higher thermal load means more of the coil's energy turns into heat instead of magnetic field. The report doesn't include a thermal load figure, because it measures the magnetic field the coil produces, not the current through the coil. Thermal load is expressed as average power in milliwatts (mW). The heat follows the square of the current times the coil's resistance, so doubling the current makes four times the heat.