semiconductor
A material that conducts a current under certain conditions is called a semiconductor. Semiconductors have electrical conductivity between that of a conductor and an insulator, and their conductivity can be controlled by factors such as temperature, applied voltage, or exposure to light. They are widely used in electronic devices such as transistors and diodes.
Material with high resistance
Material with high resistance
Material with high resistance
a circuit
A material that conducts electric current poorly is an insulator. Insulators have high resistance to the flow of electricity due to their tightly bound electrons, which do not move easily. Examples of insulators include rubber, plastic, and glass.
It must have a low resistance to the flow of electric current.
semiconductor
One example of a material that conducts electricity poorly is rubber. Rubber is an insulator and does not allow the flow of electric current easily due to its high resistance.
A semiconductor material, such as silicon or gallium arsenide, can conduct current when exposed to light. This phenomena is known as the photoelectric effect, where photons of light create electron-hole pairs that can carry electrical charge through the material.
The degree to which a material conducts electricity is known as electrical conductivity. It measures how easily electric current can flow through a material, which depends on the presence of free charge carriers, such as electrons or ions. Materials with high conductivity, like metals, allow electricity to pass through easily, while those with low conductivity, such as insulators, resist the flow of electric current.
Current theory is that the mechanism for field generation is the "geodynamo". The outer core rotates and conducts energy.