Ideal resistor is linear, that is the instantaneous current through the resistor with applied voltage is proportional to the instantaneous

A resistive material, a certain structure can limit the current in the circuit by acting from the two ends of electronic components. Resistance can not be changed is called a fixed resistor. Resistance variable called potentiometer or variable resistor. Ideal resistor is linear, that is the instantaneous electric meter the resistor is proportional to the instantaneous voltage applied. Some special resistors such as thermistors, varistors and sensitive element, the voltage and current relationship is nonlinear. Resistor is the largest number of the application of the electronic circuit component, usually the formation of different power and resistance range for circuit designers choice. mcb circuit breaker circuit is mainly used to Electric transformer the current and voltage, and a voltage divider can be used as shunt, also can make the load matching circuit. According to requirements of the circuit can be used for negative feedback amplification circuit or positive feedback, the voltage - current converter, the input voltage or overload current protection device, the RC circuit can be formed as an oscillation, filter, bypass, differentiation, integration, and the time constant components.