Question

Describe the symbol for a diode and its polarity in a circuit diagram.

Answer 1

The symbol for a diode in a circuit diagram is a simple arrow that points in the direction of the forward current flow. The diode is a two-terminal semiconductor device that allows current to flow in only one direction, from its anode to its cathode. Here's a description of the diode symbol and its polarity:

Diode Symbol:
The diode symbol is typically represented as an arrowhead attached to a line. The arrowhead points in the direction of the forward current flow. The line represents the cathode, and the arrowhead indicates the anode.

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       Anode
         |
         |
  ------>|------
         | Cathode


Polarity:

Anode (+): The anode of the diode is the positive terminal. It is represented by the side of the diode symbol where the arrow points toward.

Cathode (-): The cathode of the diode is the negative terminal. It is represented by the side of the diode symbol with the vertical line.

When you use a diode in a circuit, you need to ensure that the forward current flows from the anode to the cathode (with the arrow direction). If you apply a reverse voltage, where the cathode is more positive than the anode, the diode blocks the current flow, acting like an open switch. But when you apply a forward voltage, where the anode is more positive than the cathode, the diode conducts, allowing current to pass through it, acting like a closed switch.