Which best describes the two main functions of transistors in circuits? resisting and amplifying measuring and switching resisting and measuring switching and amplifying

The two main functions of transistors in circuits are : switching and amplifying.  A transistor is an electronic component that can act as both an amplifier and a switch. This is how a transistor can act as switch, a transistor can be flipped on an off by supplying a voltage. When you supply a voltage to the transistor, it changes the current, and the output can be greater than the input. Thus, a transistor can also act as an amplifier.