What is the maximum current you can apply to an LED?

What is the maximum current you can apply to an LED?

20mA
For standard 5mm diameter LEDs the maximum current is usually 20mA, so 10mA or 15mA are suitable values for many circuits.

What will happen to an LED if you exceed its current rating?

An LED behaves very differently to a resistor in circuit. You must reach the characteristic forward voltage to turn ‘on’ the diode or LED, but as you exceed the characteristic forward voltage, the LED’s resistance quickly drops off. Therefore, the LED will begin to draw a bunch of current and in some cases, burn out.

Do LEDs use AC or DC?

LEDs are intrinsically direct current (DC) devices that only pass current in one polarity and are typically driven by DC voltage sources using resistors, current regulators and voltage regulators to limit the voltage and current delivered to the LED.

Why is limiting current into an led important?

Limiting current into an LED is very important. An LED behaves very differently to a resistor in circuit. Resistors behave linearly according to Ohm’s law: V = IR. For example, increase the voltage across a resistor, the current will increase proportionally, as long as the resistor’s value stays the same.

Which is the key to maximizing led life?

The key to maximizing LED life is limiting the current that runs through it. This is frequently done with a simple resistor whose value is calculated using Ohm’s Law. This article reviews how to apply Ohm’s Law to single and clustered LED circuits.

How is the resistance of an led determined?

Increasing the R v setting adds resistance to the circuit, decreasing the current through the LED. When R v is at its maximum setting, the minimum amount of current flows through the LED. The value of R v is given by:

How is the life of an led determined?

There’s good reason for that: When operated within specs, an LED has a lifetime of 100,000 hours or more. The key to maximizing LED life is limiting the current that runs through it. This is frequently done with a simple resistor whose value is calculated using Ohm’s Law.