What makes it a load resistor is the fact that it is placed at the output of something. It's used, for example, to model the current draw you expect when you connect something to i. Actual resistive loads are rarely called "load resistors". The widest used real-world mostly resistive loads are light bulbs, and nobody calls them "load resistors". The generalization of this concept is the load impedance. Inductive loads are widely used to model motors, for example. If you consider an electrical circuit is intended to act upon some other device in order to perform "work" then that external device is the "LOAD" of the circuit.
So you can see, they are strictly speaking BOTH loads depending on where you look. However, generally speaking we say the thing that does the intended work of the circuit is the load.
As such load resistor can also have several meanings. The load on that circuit is the effective impedance of all those components on the right. However, because of the way this regulator works, it must have something attached to it to draw a minimum current in order for it to regulate properly.
Load, and Load resistor in particular, is a vague concept intended to focus function on the objects in question and is always referenced back to something that is driving said load.
Load resistor in particular is heavily used during education to allow you to mathematically model circuits. Just like I have done above. In reality the load is seldom a resistor. It may be very small, or may need to be physically big, depending on how much power it has to dissipate.
When you see descriptions of circuits, various resistors might be qualified by what they do, so you may see resistors called 'feedback', 'damping', 'source', 'bias', 'potential divider', 'isolating', they are all general resistors. There is an implication that it will be dissipating a reasonable amount of power otherwise it wouldn't be much of a load but this isn't a requirement.
A load resistor is simply a resistor being used as a load. It's not a special type of resistor. A load is anything that consumes power, whether it be a resistor, a capacitor, an inductor, or any combination of these three. A load resistor is supposed to be a pure resistive load that dissipates power as stated by Ohm's Law:.
In the case of inductive and capacitive loads, replace R with impedance Z which is a combination of resistance and reactance. 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. These are just two ways that control networks are dependent on specific load resistors.
If you are having trouble with your control network communications, be sure to check the documentation for your devices to see if load resistance could be part of your problem. We come across this issue more often than you might think.
Because it is a detail, it can be a difficult one to identify — causing downtime and frustration. Contact us if you have questions regarding the wiring of your APG devices. This is one of several examples of wiring and networking issues that can alter or altogether ruin an otherwise good reading from a healthy sensor. Load Resistance Defined At the most basic level, load resistance is the cumulative resistance of a circuit, as seen by the voltage, current, or power source driving that circuit.
Line Separation Signal Conversion Line Separation Modbus control networks, and others similar to Modbus, use two wires for communication. Signal Conversion Other communication and control networks, such as HART, use load resistors to convert current signals to voltage signals. Check Your Documentation These are just two ways that control networks are dependent on specific load resistors.
Some other common resistor types include the film resistor and the wire-wound resistor. Resistors are essential to many electoral circuits, and they can be applied to a myriad of different applications.
Protect against voltage spikes. Resistors also protect components against voltage spikes. Components that are sensitive to a high electrical current, like LED lights, will be damaged if there is not a resistor to control the flow of the electrical current. In addition, fuses and circuit breakers can also be used to protect your electrical circuit against voltage spikes.
Provide the proper voltage. Resistors ensure components receive the proper voltage by creating a voltage drop, and they can protect a component from voltage spikes. Each component in an electrical circuit, like a light or a switch, requires a specific voltage. If a component in your circuit requires less voltage than the rest of your circuit, a resistor will create a voltage drop to ensure the component does not receive too much voltage.
The resistor will create a voltage drop by slowing down, or resisting, the electrons as they try to flow through the resistor. If a component receives too much voltage, it may be damaged or not function properly. When upgrading incandescent turn signals to LED, an LED load resistor is required for each light in order to ensure the turn signals work properly.
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