Electronic loads have found a variety of applications ranging from power converter testing to current modulation. A large range of power sources can be tested using an electronic load from converters, inverters and UPSs to electrochemical sources such as batteries and fuel cells. They are easy to use and provide much higher throughput than resistors when varying loads are needed. For battery testing, they provide a constant loading which can greatly reduce the time for test when compared to resistor load banks.