As shown in the given diagram of full wave bridge rectifier it consists of four diodes under the condition in which four diodes are connected the called bridge circuit. So due to this type of circuit is named bridge rectifier. A resistor is connected in the circuit whiere rectified output voltage appears called load resistor R_L

Working of Bridge Rectifier

During the positive input half cycle terminal M of the secondary is positive and N is negative. Diode D₁ and D₃ becomes forward bias where as D₂ and D₄ are reversed bias. Hence the current flows along point M, E, A, B, C, F and N producing a drop across R_L.

During the negative input half cycle secondary terminal N becomes positive and M is negative. Now D₂ and D₄ are forward bias and D₁ and D₃ are reversed bias. Now the current flows along points N, E, A, B, C, F and M. Hence we find that current keeps flowing through load resistance R_L in the same direction (A, B). during both half cycles of the AC input the point A of the bridge rectifier always acts as an anode and point C as cathod. It frequency is twice that of supply frequency.