Planar resistors are types of resistors that mount directly on a chassis, usually by soldering. They are usually found in electronic circuits, like audio amplifiers and power controllers. They are designed to provide precise resistance values over a wide range of temperatures and operating conditions. They are also designed to be compact and lightweight, which makes them easier to use in confined spaces. Some versions can provide resistive values up to hundreds of MegaOhms. They also provide excellent thermal conductivity, which helps dissipate heat produced due to current passing through the resistor.