As we know that capacitive reactance or impedance depends inversely on frequency & that of inductor depends directly, as DC frequency is zero, so an inductor acts like a closed switch, while capacitor will act as an open switch & also gets charged.Guidic is the most convenient & reliable online grievance platform for doubt clearance with verified experts in all. GUIDIC | Career Education Guidance, Career Experts, Counseling Online
The values of Capacitor and Inductor does not change in general with changing frequency. However, the Capacitive reactance (Xc) and the Inductive reactance (XL) does change with changing frequencies.Xc varies inversely with supply frequency, Xc = (1/2*pi*f*C) whereas, XL varies directly with frequency, XL = 2*pi*f*L.Resistance will increase with increase in frequency and the phenomena is known as Skin effect. However, some significant increase in frequency is needed.
An inductor and a resistor are connected in series across an AC source?
The true statement is, "The current in the circuit is zero." Because, A fully discharged inductor (no magnetic field), having zero current through it, will initially act as an open-circuit when attached to a source of voltage. So due to a open circuit there will be no current in the circuit.
A resistor of 900 ohms, a capacitor of .25uF, and inductor of 2.5H are connect in series across a 240-HZ AC ..?
In order to find the impedance, we must first calculate the inductive and capacitive reactance. XC = 1 / (2pi * F * C) XL = 2pi * F * L XC = 2,650 ohms XL = 3,770 ohms Inductive and capacitive reactances cancel each other out, so the total reactance of the circuit is XL - XC X = 3,770 - 2650 = 1120 ohms Notice that the inductive reactance is larger than the capacitive reactance. This means that the circuit is primarily inductive, and that the current will lag the voltage. If the capacitive reactance was larger, current would lead the voltage. The impedance, in rectangular form, is: Z = 900 + J1120 The total impedance is the magnitude of the phasor sum of the reactance and resistance. Z = sqrt( 900^2 + 1120^2 ) Z = 1440 ohms The phase angle is the angle between the circuit phasor and the origin. Theta = arctan( 1120 / 900 ) Theta = 51.2 degrees To find the maximum current, you need Ohm's law, and the voltage expressed in peak, which it already is. I = 140 / 1440 = 97.2 mA So, the answers to your questions, in order: 1) What is the impedance of the circuit? 1440 ohms 2) The maximum current delivered by the source? 97.2 mA 3) The phase angle between the current and voltage? 51.2 degrees 4) Is the current leading or lagging the voltage? Lagging
Set the digital multimeter dial on highest resistance in ohm section.Connect the probes to two ends of the unknown component (ignore polarity).If reading shows zero, it is an inductor.If reading shows some constant value other than “1” then it is a resistor.If reading keeps increasing and finally settles on “1” then it is a capacitor. This will happen only the first time you measure. For checking again you should shot both ends of the component for 2–5 seconds and then measure again.If reading shows constant “1” then it could be a capacitor or resistor. Follow following steps to identifyReverse the probes and check reading.If reading keeps increasing and finally settles on “1” then it is a capacitor and the positive, negative is according to the terminals of multimeter connected.If reading still shows “1” then decrease the resistance range using dial and check reading. Keep decreasing and checking till the display shows some other value than “1”. This is a resistor with the shown value.References:How do I determine if a component is a resistor or an inductor?How to Test a Capacitor? 6 Ways to Check a Capacitor - Electrical Technology
Magnitude of the voltage across a resistor connected to an inductor?
At a particular instant in the circuit below, the voltage across the power supply and the current are in the directions shown, and are decreasing in magnitude. If, at this instant, the voltage across the power supply is 91 V and the voltage across the inductor is 23 V, what is the magnitude of the voltage across the resistor?
Inductors, capacitors and resistors are what are called “passive” components, If “ideal” they each have a single “value” and their behaviour is determined by just the current or voltage applied. Transistors and diodes are considered “active” because they can control the voltages or current applied. They have non-linearities and these are put to use in electronic circuits to control the power from a supply, amplify a signal or switch a voltage or current.Most electronic circuits use both active and passive components, if they are built from discrete parts. However in integrated circuits, it is common to use a limited number of passive components. Mostly these circuits utilize transistors. To a limited extent capacitors and resistors are used and pretty well no inductors - except a very high frequencies..