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AC current tends to flow towards the surface of a conductor due to what is known as the skin effect. This phenomenon acts to reduce the effective cross-sectional area of a conductor and, therefore, elevate its resistance. This elevated value of resistance is known as AC resistance.
The skin effect increases with frequency. At 50/60 Hz, the skin effect is quite moderate and, so, the AC resistance is not significantly higher than the true (or DC) resistance of the conductor.
As to 'which value of resistance is correct?' Well, the natural resistance of a conductor is directly-proportional to its cross-sectional area and resistivity, and inversely-proportional to its length and the type of current plays no part in this. This is the value that a DC current would 'see', so you could say that this would be the 'correct' value of resistance.
What else can I help you with?
How many amps is 20v dc 18v ac 35va dc max?
To convert VA to amps for DC, you can use the formula: Amps = VA / Volts. For the given values, the max DC current would be 35VA / 20V = 1.75A. The 18V AC value cannot be directly converted to amps without additional information.
Is fluorescent lights fixtures ac or dc?
The basic fluorescent light fixture is AC, although there are fluorescent lights powered by DC.
Is there a formula for converting dc watts to ac watts?
Power is as easy as PIE (P=IxE). Watts equals the current squared time the resistance. Assuming a pure resistive load; they are equal. To answer the question precisely, one DC watt equals one AC watt.
Can you use an AC Dimmer Switch on a DC fan?
No, an AC dimmer switch is designed to work with AC-powered devices, not DC. DC fans require a different type of dimmer switch specifically rated for DC power. Using an AC dimmer switch on a DC fan can potentially damage the fan or the switch itself.
Battery ac or DC?
Batteries can provide both AC (alternating current) or DC (direct current) power, depending on the type of device they are connected to. However, most batteries themselves supply DC power. Devices that require AC power typically use an inverter to convert the battery's DC power into AC power.
What is a difference between DC and ac resistance and expline DC resistasce?
DC is just direct current into a resistance it is a linear function. AC if the resistance is non reactive it would be the same linear function.
How do you change dc values to ac values?
To convert DC values to AC values if you are wanting RMS values they are the same. 100V DC and 100V AC (RMS) are the same "value". If you want to know the Peak-To-Peak AC value you would multiply the RMS value by 1.414. So 100V AC RMS equals 141.4 V Peak to Peak.
How many things can a multi meter measure?
Resistance Voltage (both AC and DC) Current (both AC and DC)
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 are the three main function of the multimeter?
A typical multimeter can measure: * AC & DC voltage (volt) * AC & DC current (amp) * resistance (ohm)
Ac voltage applied across a load resistance produce alternating current?
The reason an AC voltage applied across a load resistance produces alternating current is because when you have AC voltage you have to have AC current. If DC voltage is applied, DC current is produced.
What is the formula to calculate AC resistance if the DC resistance is known?
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.
Will value of J be same if ac were used instead of dc?
The number of Joules (energy) is the same as dc provided the RMS values of the ac quantities are used.
What is the opposition to the current flow?
resistance is the opposition to the flow of electric charge
What is difference between ac and DC amplifier?
AC amplifiers are used to amplify AC signals and use components that handle large voltage values. DC amplifiers are used to amplify DC signals which use small powered electronic devices.
What is the difference between DC and AC resistance?
AC resistance should NOT be confused with IMPEDANCE or REACTANCE.When AC flows through a conductor, it tends to flow towards the surface of that conductor due to a phenomenon called the 'skin effect'. The skin effect, therefore, acts to reduce the effective cross-sectional area of the conductor. Since resistance is inversely-proportional to cross-sectional area, the result is an elevated value of resistance compared with that to DC current. This is called AC RESISTANCE, and it increases with frequency. At mains frequencies (50/60 Hz), AC resistance is not dramatically higher than DC resistance but the difference becomes significant at high frequencies.Read more in the Related link shown below this answer.
How do you solve AC circuits problems?
Use of complex numbers for circuit values (e.g. voltages, currents, reactances) is required to get correct answers for AC. The equations are the same as for DC circuits, but the numbers are complex not real. Also reactances vary with the frequency of the AC signals in the circuit.
