Mainly vacuum tubes.
triode ....is not the answer point contact is the answer
These components are semiconductors.
A transistor is a solid state electronic device that replaced vacuum tubes for most uses.
capacitor,transistor,resistor,inductor
The answer to the question is TRANSISTER
Transistor.
A transistor is a device used to switch power between electrical components. Transistors work to amplify existing signals as well as open and close circuits.
The transistor replaced the vacuum tube as the primary component in electronic devices, offering smaller size, lower power consumption, and higher reliability. This transition marked the beginning of the semiconductor era in electronics.
No, it needs several other components and a source of power.
A: A diode a capacitor even a transistor must be connected to the the power as a polarized components
No. The PNP and NPN transistors are exactly opposite each other in polarity. You cannot just replace one for the other without redesigning the circuit.
A transistor is a semiconductor device used to amplify or switch electronic signals, while a resistor is an electrical component that resists the flow of current in a circuit, thereby controlling the amount of current. Transistors are active components that can amplify signals, while resistors are passive components that mainly control the current and voltage levels in a circuit.