A 100-watt dummy load is an electrical device used to simulate an electrical load, typically for testing purposes. It absorbs electrical power and dissipates it as heat, ensuring that circuits or systems can be tested under load without being connected to the actual end-use devices. Dummy loads are commonly used in radio frequency (RF) applications, audio systems, and power supplies to test performance, stability, and thermal management under a controlled load condition. They consist of resistors with sufficient power handling capability and heat dissipation features to safely handle the applied power without damage.