CURRENT LIMITING RESISTOR CALCULATOR Circuit Diagram 1- We want to design a current limiter and the maximum allowable current is 0.5 amps. We know that the base-emitter voltage (Vbe) of transistor T2 is 0.7 volts and the allowed maximum current is 0.5 amps. The resistor to be used, to achieve our goal is: R = Vbe / ILmax = 0.7 V / 0.5 Amps = 1.4 ohms. We can use a 1.5 ohm resistor. A fuse as well as a current limiting resistor both protect circuits however they work differently. A fuse is a safety device. If too much current flows, it breaks the circuit protecting the system. A current limiting resistor imposes resistance which restricts current, while when overloaded a current limit resistor does not break the circuit.
In this video, Resistor as a current limiter, I've explained how to use a current limiter resistor and how to calculate the value of resistor._____
Current Limiting Circuit: Electronics Circuits Explained Circuit Diagram
Some components, such as light-emitting diodes, are very sensitive to current. A few milliamps of current is enough to make an LED glow; a few hundred milliamps is enough to destroy the LED. Project 2-1 shows you how to build a simple circuit that demonstrates how a resistor can be used to limit current to an LED. Current limiting circuits are applicable in electronic circuits to restrict the flow of current through a load. They have various applications, including the following: Power Supplies : Power supply circuits often use current limiting circuits to safeguard their components from overcurrent situations.
Next, we need to use a suitable power of resistor. P = V x I. V = 6V I = the current of relay = 0.075A. So power of resistor is. = 6V x 0.075A = 0.45W We can use 82 ohms 0.5W resistor. Note: I taught my son to use this current-limiting resistor many years ago. and recently I taught my daughter this again. It is the basics that beginners To calculate the current limiter resistor, we will need to look at the figure below. The figure displays a variable resistor that you can use to set the current control. For the R1, you can replace it with a fixed resistor by calculating it with the indicated formula: R1 (limiting resistor) = Vref/current . Alternatively . R1 = 1.25/current Current limiting resistors are simple yet important circuit components that restrict current flow to safe levels in electronic systems. This guide provides a comprehensive overview of what current limiting resistors are, how they work, why we use them, how to select appropriate values and examples of their key applications.
