What is the impedance of the circuit with a resistance of 4 ohm and inductive resistance in an AC circuit?
If by inductive resistance you mean reactance, then the total impedance is the square root of the sum of the squares of resistance and reactance.The reactance depends on the frequency ie. X = 2πf LThe Impedance Z is like the hypotenuse of a right angle triangle
The impedance of a series circuit of 3 ohms and 4 ohms reactance. What is the power factor of the circuit?
Homework :)
What is the impedance of a coil having resistance 3 ohms and resistance 4 ohms?
You have to specify they are connected in series or they are connected in parallel and if you know the individual impedances of each coil as you say 3ohm and 5ohm you shall add them and have 8ohm impedance in series connection.For parallel connection use the formula of parallel resistances.1/Z = 1/Z(of 1st coil) + 1/Z(of 2nd coil)
In an R L circuit, the resistance is 2 ohm, and inductance is 4 millihenry, what is the inductive reactance and impedance?
You need the frequency.....XL = 2 x Pi x f x LZ = Root (R^2 + XL^2)
A circuit consisting of a resistance of 12 ohms and an inductance of 0,2 Henry in series is connected to a 250V, 50Hz supply. What current will flow in the circuit?
First, calculate the inductive reactance of 0.2 H at 50 Hz, which is given by 2piFL and expressed in ohms:XL = 2piFL = 2 x 3.1416 x 50 Hz x .2 H = 62.83 ohmsThen add the above value to the series resistance of 12 ohms:62.83 ohms + 12 ohms = 74.83 ohmsUsing Ohm's’ Law, calculate the current through 74.8 ohms when applying a potential of 250 volts:E/R = I250 volts / 74.83 ohms = 3.34 amperes
A series AC circuit has a resistance of 4 ohms and a reactance of 3 ohms. What is the impedance of a circuit?
The impedance is 4 + j3 Ω.The magnitude of the impedance is √(4² + 3²) = 5 Ω.
A circuit has a resistance of 12 ohms and independence of 15 ohms. What is the power factor of the circuit?
Given how your question was written, I’m going to assume that (a) it’s a homework problem, and (b) you aren’t regularly attending (let alone taking notes in) whatever class that homework was assigned.That said, in order to solve the problem, several assumptions are necessary:The “resistance” (R) is a pure resistance (i.e., zero reactance).Your “independence” term actually refers to impedance.The impedance in (2) is a pure reactance (X) (i.e., zero resistance)It’s unknown whether the reactance in (3) is inductive or capacitive..That said, the power factor of the circuit is given by:Note that because of assumption (4), the sign (positive or negative) of the circuit power factor cannot be established, only its magnitude. If the reactance in (3) is inductive, then the sign of the power factor is positive. if the reactance is capacitive, then the sign of the power factor is negative.Obviously, if assumptions (1) and/or (3) are incorrect, the problem cannot be solved without knowing the X/R ratio of the associated impedances.
The impedance of a coil is 141.4ohm at 50hz and it's resistance is 100 ohm. What will be its inductance?
Looking at the values given this is clearly a test question, so you really need to understand the basic theory supporting evaluation of a.c. circuits.The first thing to understand is that for a purely resistive circuit the current and voltage waveforms will be in-phase. This means that peak power is delivered when both current and voltage are at their peak value.However in purely inductive circuits the current lags the voltage by 90 degrees. In this case when voltage is at a peak the current is zero, so no power is delivered. Similarly, when current is at a peak the voltage is zero, so no power is delivered. Peak power will actually be delivered halfway between these two points.For a circuit having both resistance and inductance we then need to calculate the vector sum of these two components as described in Paul Crumley’s answer.A similar calculation can be applied to circuits having capacitive reactance, but in that case the current leads the voltage by 90 degrees.For a visual representation see hereAC Inductor Circuits
What is the power factor of a circuit of 50 ohm resistance and 100 ohm impedance?
First of all impedance is combination of resistance and reactance.It’s in the form of R+jX.But there is no imaginary part in impedance you mentioned.Check it again or if it is really just 100ohm then power factor is 1.
In RL circuit, the resistance is 2 ohm and inductance is 4 millihenry. What is inductive reactance and impedance?
You state that the inductance is 4 millihenry. Its reactance, given in ohms, will vary with the applied frequency. If ‘f’ is the frequency, the inductive reactance is 2 X Pi X f. For the same inductance, the higher the frequency, the greater is the reactance. Pi’s numerical value is approximately 3.1416.I presume that the impedance asked is for the series RL circuit. It too depends on the frequency and is given by { R^2 + (2 X Pi X f)^2}^ 0.5.