In a series circuit with resistors it does not really matter if the resistor comes before or after the diode. Most resistors have a much higher resistance so when a forward biased diode and a resistor are in series as in the this circuit the total resistance is pretty much the same as the resistors resistance. Flyback Diode Wikipedia Diodes In Series Do A Diode And A Resistor In Parallel Have The Same Voltage An led light emitting diode emits light when an electric current passes through it. Diode with resistor in series . It uses this extra energy to output light. Such a resistor is often called a ballast resistor. The stabilised output voltage v out is taken from across the zener diode. Resistor r s is connected in series with the zener diode to limit the current flow through the diode with the voltage source v s being connected across the c...
