# Why do we need a load resistor?

## Why do we need a load resistor?

Load resistors are used for impedance matching, maximum power transfer, to improve output stability and to ensure a minimum of current flow. in switching power supplies, they are essential for the proper operation of the psu.

### Why is resistance necessary in a circuit?

Resistance causes some of the electrical energy to turn into heat so some electrical energy is lost along the way. Therefore, it is sometimes useful to add components called resistors (see picture below) into an electrical circuit to restrict the flow of electricity and protect the components in the circuit.

Why is it necessary to add a resistor in the circuit above?

The secondary functions that make resistors useful are: converts voltage to current and current to voltage per Ohm’s Law. Controls or limits current flow. Creates voltage drops when needed for example voltage dividers.

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What is the purpose of load resistor if there is led at the output?

Resistors in Light Emitting Diode (LED) Circuits Such a resistor is often called a ballast resistor. The ballast resistor is used to limit the current through the LED and to prevent excess current that can burn out the LED. If the voltage source is equal to the voltage drop of the LED, no resistor is required.

## Is a resistor considered a load?

In a circuit, an element which consumes electric power is considered as a load. Resistor also consumes power. So, resistor can be represented instead of load, or, every load is consuming power as the same way as resistor consumes. Example of load in electric circuits are appliances and lights.

### What is resistor in a circuit?

The resistor is a passive electrical component that creates resistance in the flow of electric current. In almost all electrical networks and electronic circuits they can be found. The resistance is measured in ohms (Ω).

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Can a circuit work without a resistor?

a) If there is no resistor in the circuit ( as in , if you completely remove the resistor) , then there will be no current flowing in the circuit. However, there will be a voltage at the 2 terminal points where the removed resistor used to be.

Why do we need resistors in the electronic circuits in Arduino?

When building your Arduino projects, you use resistors to limit the amount of current going to certain components in the circuit, such as LEDs and integrated circuits.