Why Is A Series Resistor Used With An Led

Why do you need a resistor with an led. The simplest circuit to power an led is a voltage source with a resistor and an led in series.

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If you look at the graph above you can rise the voltage from 0 volt to 16 volt without resulting in noticeable current.

Why is a series resistor used with an led. Obviously that does not work with leds because they dont behave like a linear resistor. Apply a bit more voltage and there is current and the led lights up. In a typical application a resistor is connected in series with an led makes enough current flows to make the led light up but not so much that the led is damaged.

So its vital to stay within the limits of the led. An led light emitting diode emits light when an electric current passes through it. I led forward current in amps found in the led datasheet.

A resistor is used in series with the led to keep the current at a specific level called the characteristic or recommended forward current. If the voltage source is equal to the voltage drop of the led no resistor is required. Using the circuit above you will need to know three values in order to determine the current limiting resistor value.

To limit the current in the led to a safe value. Why is it necessary to use a resistor in series with an led. The ballast resistor is used to limit the current through the led and to prevent that it burns.

This is why we use an series resistor with leds when current is not constant. It mitigates most of the unpredictable properties of leds. Proper parallel led circuits have a series resistor for each led.

An led usually has a resistor connected in series with it because an led light emitting diode is not linear in current to voltage like a resistor and has to be operated within specified. If you would attach an led to a 5 volt power supply directly you would burn it instantly. Such a resistor is often called a ballast resistor.

The current flowing in an led is an exponential function of voltage across the led. The ballast resistor is used to limit the current through the led and to prevent that it burns. Leds are semiconductors diodes in particular.

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