An LED is to be connected into a 40-volt DC circuit. If the LED has a maximum current flow of 20 mA, what size resistor should be used to limit the current flow through the LED?

Given Data: The voltage across the DC circuit is V = 40 V. The maximum current is I = 20 mA. The…

Answered: An LED is to be connected into a…

Understanding Motor Controls

4th Edition

ISBN:9781337798686

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter47: Light-emitting Diodes And Photodiodes

Section: Chapter Questions

Problem 5RQ

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An LED is to be connected into a 40-volt DC circuit. If the LED has a maximum current flow of 20 mA, what size resistor should be used to limit the current flow through the LED?

Expert Solution

Step 1

Given Data:

The voltage across the DC circuit is V = 40 V.
The maximum current is I = 20 mA.

The expression for Ohm's law is,

$\begin{array}{rcl} V & = & I R \\ R & = & \frac{V}{I} \end{array}$

Where R is the resistance in the circuit.

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