At the museum of technology I thought the Photovoltaic models and Incerter display was intriguing. It allowed for interaction with the exhibit by changing the direct current to an alternating current. Photovoltaic means to use sunlight, and Inverter is to convert direct current to alternating current. Therefore, a photovoltaic module uses sunlight to generate direct current which is then converted into  alternating current. This is converted to AC because it is more efficient to transport.