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AC resistance is the term used to describe the elevated value of resistance due to the reduction in a conductor's effective cross-sectional area due to the the skin effect caused by an alternating current. The skin effect describes how AC current tends to flow towards the surface of a conductor, rather than being distributed across the entire cross-sectional area as is the case for a DC current.
For 50/60 Hz supplies the skin effect is not great and, so, there will not be a great difference between the DC resistance and AC resistance of a winding. Accordingly, it will be very difficult to calculate the winding's AC resistance, as its value is likely to be masked by experimental error and the accuracy of the instruments.
In theory, by using a wattmeter and an ammeter, the resistance of a load -in this case a winding- the readings can be inserted into the equation: R = P/I2. Using a DC supply will reveal the (DC) resistance value, and using an AC supply will reveal the AC resistance value. As explained, a combination of experimental error and instrument accuracy is very likely to mask any actual difference between the two resulting values.
So, at mains' frequencies, the difference between AC resistance and actual (DC) resistance would be very difficult to determine with any degree of accuracy.
What else can I help you with?
How do you calculate ampere given 220v AC 40KW?
The formula you are looking for is I = W/E
What is ac and DC resistance of a diode?
diodes follow an exponential curve meaning non linear in nature. by using Boltzmann formula an impedance can be calculated. That would be the AC Resistance the dc resistance on any device is the voltage drop divided by the dc current.
What is the opposition to the current flow?
resistance is the opposition to the flow of electric charge
Does the resistance depend on the frequency?
Yes. The resistance does depend on frequency. The reason is 'skin effect'. When an alternating current is passed through a conductor only a small portion of the conductor, usually called the skin depth carries the current. The value of skin depth is inversely proportional to frequency. As the frequency is increased, the skin depth decreases. But the value of ac resistance is directly proportional to frequency, or in other words, inversely proportional to skin depth. Thus, at higher frequencies, ac resistance is higher. This is the reason why we multiply the dc resistance by an empirical value 1.2 or 1.3 to calculate its ac equivalent.
What is ac resistance of a diode?
ratio of ac voltage applied across the diode to the ac current flowing through it
How you can calculate ampere?
Voltage (volts) divided by Resistance (ohms). For AC circuits the resistance part of this formula is replaced by "impedance" which involves the effects of capacitors and inductors as well.
How do you calculate ampere given 220v AC 40KW?
The formula you are looking for is I = W/E
What is ac and DC resistance of a diode?
diodes follow an exponential curve meaning non linear in nature. by using Boltzmann formula an impedance can be calculated. That would be the AC Resistance the dc resistance on any device is the voltage drop divided by the dc current.
What is the formula for phase angle?
Phase angle is defined as the angle by which the load current leads or lags the supply voltage in an AC circuit. There are numerous ways to calculate a circuit's phase angle, so there is no 'formula' as such. For example, if you know a load's resistance and impedance, or its true power and apparent power, then you can use basic trigonometry to calculate the phase angle, and so on.
Formula for power loss in ac cables?
P = I2R Where: P = power loss I = current R = resistance
How do you calculate inductive resistance in a parallel circuit when your known is 150vr?
To calculate inductive resistance (also known as inductive reactance) in a parallel circuit, you first need to determine the frequency (f) of the alternating current (AC) supply and the inductance (L) of the inductor in henries. The inductive reactance (X_L) is calculated using the formula (X_L = 2\pi f L). Once you have X_L, you can use it in conjunction with the voltage (150 V) to find the current through the inductor using Ohm's Law: (I = \frac{V}{X_L}). If you need the total impedance or equivalent resistance in the parallel circuit, you would also need to consider the other branches of the circuit.
What is the formula to find resistance in conductors?
For DC circuits: R = l*p / A R - resistance l = length of the conductor p = electrical resistivity A = the cross sectional area Calculating for AC, and especially three phase power becomes much more complicated. If you need to know more for AC, let me know specifics.
Ac to DC formula?
formula for ac to dc
How do you calculate primary AC for 3 phase ac input if output load dc current is known?
DC Current divided by 1.225
What is AC forward resistance?
AC forward resistance refers to the effective resistance experienced by an alternating current (AC) signal as it passes through a diode in the forward-bias direction. It is influenced by the diode's intrinsic resistance, as well as the capacitance and inductance of the diode. The AC forward resistance can impact the efficiency and performance of the diode in rectifying AC signals.
How do you calculate 3ph AC motor power?
How do you calculate 3ph AC motor power?
When given the formula ac-d what is c?
ac - d is an expression: it is NOT a formula.
