<Ul> <Li> Bipolar transistor </Li> <Li> Darlington transistor </Li> <Li> Field - effect transistor </Li> <Li> Insulated-gate bipolar transistor (IGBT) </Li> <Li> Silicon - controlled rectifier </Li> <Li> Thyristor </Li> <Li> TRIAC </Li> <Li> Unijunction transistor </Li> </Ul> <Li> Field - effect transistor </Li> <Li> Insulated-gate bipolar transistor (IGBT) </Li> <Li> Silicon - controlled rectifier </Li>

The simplest and least expensive form of discovery is a(n)