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Aladin
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What is the main purpose of a resistance in a circut.
Nomy-the wanderer said:I didn't mean by functional that it wouldn't work without it, but i meant there would be no purpose for the circuit without a resistance, practically, most of the the machines, and electrical devices are regarded as resistances..
Nomy-the wanderer said:Resistances in the wire, would produce a lot of un-needed heat, that would cause damage to the circuit, but inductance is a resistor current wise...
Q_Goest said:If you look at a typical piece of electronic hardware, you'll find dozens of resistors stuck all over the circuit board. I'd assume that none of these are used to create heat. So what are these resistors used for?
Antiphon said:If you put a load on the motor shaft, there will be a current flowing
into the motor and a voltage across the motor and will LOOK like a
resistor. This was what Nomy's point was. What I wanted to clarify
was that this arrangement was NOT a resistor, but it only looks like one
electrically at the motor terminals.
In a circuit, resistance is used to control the flow of electric current. It is a measure of how much a material or component opposes the flow of electricity. Without resistance, the current would flow through the circuit uncontrollably, potentially causing damage to the components.
The higher the resistance in a circuit, the lower the amount of current that can flow through it. This is because resistance causes a voltage drop, reducing the energy and slowing down the flow of electrons. In other words, resistance acts as a barrier to the flow of current.
The amount of resistance in a circuit is affected by several factors, including the type of material used, the length and thickness of the wire, and the temperature. Different materials have different levels of resistance, and longer or thinner wires will have more resistance than shorter or thicker wires. Temperature can also affect resistance, with many materials becoming more resistant as they get hotter.
The unit of measurement for resistance is ohms (Ω). It can be measured using a multimeter, which is a device that measures voltage, current, and resistance. A higher resistance reading indicates a higher level of opposition to the flow of current.
There are three main types of resistance in a circuit: fixed, variable, and non-linear. Fixed resistance refers to a component with a constant level of resistance, such as a resistor. Variable resistance allows for the adjustment of the resistance level, such as a potentiometer. Non-linear resistance, also known as non-ohmic resistance, does not follow Ohm's law and changes with the voltage or current level, such as in a diode or LED.