When measuring the characteristics of a device that outputs energy, such as a power supply or battery, a load that consumes energy is required. Variable resistors can be used for simple loads, but they may not be suitable for loads with complex behaviors. Electronic load devices are devices that use semiconductors such as transistors instead of variable resistors. Electronic load devices using semiconductors can be used as a variety of loads by incorporating a control circuit, since the current and voltage can be varied freely.
