A bridge rectifier is used to convert alternating current (AC) to direct current (DC), which can be used elsewhere in the circuit.
This type of full-wave rectifier uses a standard transformer and four diodes in a bridge configuration. The bridge configuration of the diodes is what allows it to rectify the full AC wave without using a center-tapped transformer like a standard full-wave rectifier. Instead, bridge rectifiers use a standard transformer, reducing the cost of the circuit. Pd Detector
In the diagram above, the positive DC voltage output is located at a top pole. Without filtering, the voltage swings rapidly through poles between the output voltage and the initial AC voltage. A filter capacitor placed between the plus voltage and ground will drastically reduce these swings. Two poles on opposite sides connect the alternating current, a bottom pole acts as the DC ground.
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Current Transformer Measuring Bridge These components are commonly found in power supplies and require other passive components, such as capacitors, to filter the DC power to be used in the rest of the circuit.