![]() ![]() When the positive probe (usually red) is touching the anode and the negative probe (usually black) is touching the cathode the multimeter will show a resistance reading. Others have only two leads (positive and negative) and have a built-in electronic controller. The anode is a direct opposite, acting as the donor. The cathode plays the role of an electron acceptor. Failing this - most m ultimeters will have a 'diode setting' too test for polarity. A four-lead arrangement is typical with one common lead (anode or cathode) and an additional lead for each color. The anode is referred to as the positive terminal the cathode is referred to as the negative terminal.Because diodes are made of semiconductor material, they have a very specific voltage where they will turn on. The voltage supply side of the diode is the positive (+) side, this is called the anode. The smaller plate indicates the positive (anode) lead the larger plate belongs to the negative (cathode) lead. For an LED to work it needs to be connected to a voltage source with the correct side. ![]() If the legs have been shortened there may be a flat edge on the LED casing which will indicate the CATHODE (-). If the LED has two leads with leads that are equal in length, you can look at the metal plate inside the LED.In most cases the long 'leg' or pin will be the ANODE (+).There are a few indicators that can help you work out which pin of the LED is the cathode and which pin of the LED is the anode. the circuit diagram symbol for an LED is shown below and the direction of flow is also indicated by the arrow. If the LED is connected in the wrong direction it will not illuminate and may damage the LED. The current flow can flow only from the ANODE (+) terminal to the CATHODE (-) terminal. LEDs come with unequal terminal lengths so that users can recognize the. It is very important that LEDs are connected to a circuit in the right direction. LED has two terminals, the anode (long terminal) and cathode (short terminal). The positive pin is the ANODE (+) and the negative pin is the CATHODE (-). LEDs are diodes and diodes only allow electrical current to flow in one direction, therefore LEDs are polarised. ![]()
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