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What is the relationship between the resistance and the conductor

The main physical feature of a resistor is that the electrical energy is thermal energy. It can also be said that it is a dissipative component that generates internal energy as long as current passes through it. Resistors, referred to as resistors, are the most commonly used element in all electronic circuits. Resistors in the circuit usually share the role of partial pressure shunt, the signal, the AC and DC signals through the resistance. Resistance is a linear element. It is said to be a linear component because it is experimentally found that under certain conditions the current through a resistor is proportional to the voltage across the resistor - that is, it is in line with Ohm's Law: I = U / R Common Carbon Film Resistance or Metal film resistors at a constant temperature, and voltage and current values are limited to within the rated conditions, the linear resistor can be used to simulate.

Resistance has a certain resistance, which represents the size of the resistor on the current flow blocking force. The unit of resistance is ohms, symbolized by "Ω". Ohms are defined as follows: When a 1-volt voltage is applied across a resistor, the resistor has a resistance of 1 ohm if a 1-amp current is passed through this resistor.

In the SI system, the unit of resistance is Ω (ohms), in addition to KΩ (kilohms), MΩ (megawatts). Among them: 1MΩ = 1000KΩ, 1KΩ = 1000Ω. Resistor electrical performance indicators usually have a nominal resistance, error and rated power. It together with other components constitute a number of functional circuits, the role of the main function is to hinder the flow of current, used in current limiting, shunt, buck, partial pressure, load and capacitance with the filter and impedance matching.

1, the rated voltage: When the actual voltage exceeds the rated voltage, even if meet the power requirements, the resistor will be breakdown damage.

Rated Power: The rated power of the selected resistor should be more than twice the actual power to ensure the long-term reliability of the resistor in the circuit.

2, according to the resistance characteristics: fixed resistance, adjustable resistance, special resistance.

Can not be adjusted, we call the fixed resistance, and can be adjusted, we call adjustable resistance.For common, such as radio volume adjustment, mainly used in voltage distribution, we call the potentiometer.

3, according to the installation: plug-in resistors, chip resistors.

4, according to the manufacturing materials: carbon film resistors, metal film resistors, wire wound resistors.

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