Contents
Does the resistor go on the anode or cathode?
Since this resistor is only being used to limit current through the circuit, it can actually be located on either side of the LED. Placing the resistor on the positive (anode) side of the resistor will have no differing effects from placing the resistor on the negative (cathode) side of the LED.
What four terminals does the RGB LED have?
It has 4 terminals, in which 3 terminals red, green, blue, and another terminal represents anode or cathode of LED type. It is also known as tri-color LED or multi-color.
What is a anode example?
An anode is any electrode where oxidation takes place. A simple example is electrolysis of water. A positively charged platinum electrode where H2 gas is oxidized to H+ ions is the anode.
Can a resistor be connected to anode or cathode?
No there is not any difference usually a resistor is connected in series with the LED to limit the current. Whether it is connected to anode or to cathode it doesn’t make any difference. Resistor is just connected in ‘ series with the LED ‘.
Why do you need a resistor on a transistor?
However, there are designs for driving LED’s using transistors where choosing where you place your resistor does matter. For example, sometimes people will use a BJT transistor to allow for higher current drives through the LED because micro controller pins are limited to low current outputs.
When does a diode conduct like a short circuit?
In the ideal diode model, a diode does not conduct when the voltage applied to its terminals is lower than Vf or when it is reverse biased (negative to anode and positive to cathode), and conducts like a short circuit when the voltage is higher than that, while keeping the voltage between its anode and cathode constant.
Do you need resistor for Arduino colour mixing lamp?
Recently I bought the official Arduino starter kit and played around with the common cathode RGB LED that came with this kit. In the project book, the instructions for the colour mixing lamp is to use separate 220ohm resistor for each of the RGB legs. But I thought, why can’t I put the resistor on just the cathode of the LED?