You want to connect an LED to a 5V power supply, and the LED has a forward voltage drop of 2V and a forward current rating of 20mA. Calculate the value of the current-limiting resistor required to safely operate the LED in this circuit.

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Topic: Engineering Posted 1 year ago

You want to connect an LED to a 5V power supply, and the LED has a forward voltage drop of 2V and a forward current rating of 20mA. Calculate the value of the current-limiting resistor required to safely operate the LED in this circuit.

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Koala Tutor

Oct 3, 2023

Koala Ai Support

To calculate the value of the current-limiting resistor, we need to use Ohm's Law:

V = I * R

Where:
V = The voltage across the resistor (5V - 2V = 3V)
I = The desired current flowing through the LED (20mA = 0.02A)
R = The value of the current-limiting resistor (unknown)

Rearranging the equation to solve for R:

R = V / I

R = 3V / 0.02A

R = 150Ω

Therefore, a 150Ω resistor is required to safely operate the LED in this circuit.

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