Electronics & Software – Tips & Guide


What is a load resistor and why is it used

What is a load resistor and why is it used?

load resistance is a term used to define the loading parameters of a circuit. If you examine different circuits with a load resistor, changing their values will help you find the load capacity of that circuit for that load resistance.

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.

The load resistance does not differ from the normal resistance but is used at the output of the circuit. Some special facts about the load resistance:

1) A heavy load will consume more current, while a light load will consume less current.

2) in the case of non-circuit load, it will consume a minimum current.

the main reason for applying this load is to increase or decrease the power to the load according to the requirements (ie to ensure that the power remains constant in the circuit), this which can be proved with basic circuit law like kvl and kcl.

A load resistor, generically, is any resistive element connected to a power source to charge it as is, in normal operation.

Sometimes, the load resistance is variable to check the performance of the power source under different load conditions.

The two parameters to specify for any load resistance are its resistance and power.

For ac power sources, the capacitance and inductance of the load resistor must also be taken into account, especially at the highest frequencies.

A load resistor is any resistance connected to the output of a circuit . such as a lamp, a bulb, a heater, etc. A common term used but not necessarily meant to be a resistance, as it may also mean or apply to another component. as an inductor, or a complex network load ..

Resistor, a component that can represent what will be the available current is on or can be expected on the circuit that. a component that can also represent the output impedance of a particular stage. the resistance being a function of the current and the voltage, the impedance can be a complex quantity of an output … the impedance being an important factor in the transfers of power!

it’s not a load resistor, it’s a charge. The load can be resistive, inductive, capacitive or a combination thereof.


there is an interesting point about the charge.

When the load is high, the resistance / reactance of the load is low and vice versa. the load resistance is usually the resistance of the circuit that pulls all the current, but it can be anything that consumes power in the circuit, although it is the one that takes care of the output of your circuit. a load resistor can be designated as a led, or a battery in a battery charger .

Example: look for a current limiting circuit, and you will usually find a resistor referred to as a load, acts as a resistor shunt to create a voltage drop that varies in proportion to the current flowing through the load, so that an amplifier can provide feedback in the input of the circuit that controls the current through the resistor and prevents it from pulling more current than the predetermined max current.

The load resistance in this circuit represents the type of your driving attempt with which you want to control the current, which passes through it, it will usually be a battery although in this example, but it could also be a kind of sensor that can only handle a small current, which otherwise could possibly destroy it, if this value was exceeded.