Why resistor does not oppose direct current source?
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The current flowing through theresistor is directly proportional to the voltage across it with this linear relationship in an AC circuit being called Impedance. As withDC circuits, Ohm's Law can be used when working with resistorsin AC circuits to calculate theresistors voltages, currents and power.
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A resistance will oppose both AC and DC in a circuit, whereas a pure reactance will only act on either AC or DC depending on its nature. Let’s talk about this in a little more detail.
All electrical circuits work in the same way: they transfer energy from a source to a load. The load uses the energy from the source to do something useful, like generate light, heat, sound, motion, vibration, among many others.
The source can be a voltage or a current.
The load can be a resistor, inductor, or a capacitor.
A resistance opposes the current in a circuit, but a reactance also oppose the current in a circuit. What is the difference between both?
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4 ANSWERS

Rehan Maroofi, Electrical engineer.
Answered Oct 12, 2017 · Author has 188answers and 249.1k answer views
A resistance will oppose both AC and DC in a circuit, whereas a pure reactance will only act on either AC or DC depending on its nature. Let’s talk about this in a little more detail.
All electrical circuits work in the same way: they transfer energy from a source to a load. The load uses the energy from the source to do something useful, like generate light, heat, sound, motion, vibration, among many others.
The source can be a voltage or a current.
The load can be a resistor, inductor, or a capacitor.

The resistor will consume both AC and DC, while the inductor will block AC and allow only DC to pass through, and the capacitor will block DC and only allow AC to pass through.
A reactance is simply the resistance that an inductor would offer to AC, or the resistance that a capacitor would offer to DC.
The resistance of a resistor does not depend on the frequency of the AC, while the reactance of an inductor or capacitor depends on the frequency of the AC.
So, in summary, when we talk about reactance, frequency plays an important role, but when we talk about resistance, frequency does not play any role in our discussion.
All electrical circuits work in the same way: they transfer energy from a source to a load. The load uses the energy from the source to do something useful, like generate light, heat, sound, motion, vibration, among many others.
The source can be a voltage or a current.
The load can be a resistor, inductor, or a capacitor.
A resistance opposes the current in a circuit, but a reactance also oppose the current in a circuit. What is the difference between both?
Still have a question? Ask your own!
What is your question?
Ad by Mailchimp
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We can help you learn as you go so you can do more of what works.
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4 ANSWERS

Rehan Maroofi, Electrical engineer.
Answered Oct 12, 2017 · Author has 188answers and 249.1k answer views
A resistance will oppose both AC and DC in a circuit, whereas a pure reactance will only act on either AC or DC depending on its nature. Let’s talk about this in a little more detail.
All electrical circuits work in the same way: they transfer energy from a source to a load. The load uses the energy from the source to do something useful, like generate light, heat, sound, motion, vibration, among many others.
The source can be a voltage or a current.
The load can be a resistor, inductor, or a capacitor.

The resistor will consume both AC and DC, while the inductor will block AC and allow only DC to pass through, and the capacitor will block DC and only allow AC to pass through.
A reactance is simply the resistance that an inductor would offer to AC, or the resistance that a capacitor would offer to DC.
The resistance of a resistor does not depend on the frequency of the AC, while the reactance of an inductor or capacitor depends on the frequency of the AC.
So, in summary, when we talk about reactance, frequency plays an important role, but when we talk about resistance, frequency does not play any role in our discussion.
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