0
An inductor charges and discharges. When an alternating current come up, the positive signal of the current quickly charges up the inductor. when the negative signal part of the same cycle comes up the inductor develops a potential to opposes it. this is because any charge developed opposes if there is a change or break or whatever for that matter, in supply. so, the negative signal which is basically a change in signal when approaches the inductor the charge developed across it opposes it and as the charge developed thanks to the positive part of the signal is used up to oppose the negative part of the same signal, basically the charge is zero. thus an alternating current or high frequency current for that matter, does not pass through an inductor.
CommentI think the above answer has confused inductance for capacitance! No charges are involved with inductors.
Whenever current changes in an inductive circuit, a voltage is induced into that circuit. The magnitude of the induced voltage depends on the rate of change of current. The direction of the induced voltage is such that it opposes the change in current -for example, if the current is reducing in value, then the induced voltage will try to maintain that current.
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoWhen current flows through an inductor, energy is stored in a magnetic field. The amount of energy stored depends on the amount of current and the inductance of the inductor. When the amount of current flowing changes a voltage is induced across the inductor until the energy in the magnetic field is used up.
This is why a old style light bulb (which uses a coil of wire to produce heat and light) slowly fades out when the power is turned off, especially if it is a large one with a bigger coil (and therefore a higher inductance).
You could say that an inductor is the opposite of a capacitor, which stores energy in an electric field and resists a change in voltage by altering the flow of current.
Add your answer:
Earn +20 pts
What are compounds that resist changes in pH?
A buffer resists pH change.
What is an object in an electric circuit that resists the flow of electrons?
A special kind of resistor can oppose the flow of an electrical current.
When are voltage and current out of phase?
Because the impedance of the inductor and capacitor is not a real resistance / has an imaginary value that causes voltage and current to be out of phase. An inductor's impedance is equivalent to j*w*L (j = i = imaginary number, w = frequency in radians, L = inductance), while a capacitor's impedance is 1/ (j*w*C). The 'j' causes the phase shift.
Where can a HID ballast be bought?
A HID ballast can be purchased from Amazon or eBay. The term 'ballast' is used to describe large inductors used to limit AC current for fluorescent lighting.
How does a Neutral grounding resistor work?
it uses for alternator protection purpose; when fault occures in alternator it resists that fault current to gound . srikanth, kaenataka .
Highly inductive load as a constant current source?
An inductor is a device that resists a change in current. The equation is di/dt = v/L. This means that inductors are current sources, and given a sufficiently large inductor, in comparision to the circuit, it is a constant current source.
What is the function of an inductors which is installed at output of 1.5V power supply?
An inductor resists a change in current, so it can be installed in a power supply lead to reduce the effects of changing input voltage, such as what happens in a rectifier when the diode starts conducting again. Often, inductors and capacitors are used together to build a filter.
Are inductors and resistors the same thing?
No. An inductor is not a resistor, and a resistor is not an inductor.A resistor is a device that resists current by causing a known voltage drop to a known current. Ohm's law states that voltage is current times resistance.An inductor, on the other hand, resists a change in current because it is a stored energy device, working on the principle of bucking magnetic fields. The equation of an inductor is ...di/dt = v/L... which means that the rate of change of current is proportional to voltage and inversely proportional to inductance.From an analytic point of view, often we consider devices to be like resistors, and we do that for inductors as well, but that is only for an instantaneous point in time. They are not the same thing.
Why it apposes sudden changes in current?
I assume you are asking about inductors... The inductor has a winding, sometimes around a ferrous core. Current flow creates a magnetic field. When you try to change the current, the magnetic field changes, but that magnetic changing resists the change in current. Mathematically, this is expressed as di/dt = v*L, or Rate of change of Current is equal to Voltage * Inductance. So, the larger the Inductance, the harder it is (requiring larger Voltage) to change Current.
Why current leads in capaciter?
Capacitors resist a change in voltage. It takes current to effect a voltage change, resulting in the current "leading" the voltage. Similarly, inductors resist a change in current. It takes voltage to effect a current change, resulting in the current "lagging" the voltage.
Inductor and capacitor?
An inductor is a magnetic device that resists a change in current. It is constructed with windings that can be backed by ferro-magnetic cores. The equation of an inductor is ... di/dt = V/L ... meaning that the rate of change of current per time is proportional to voltage and inversely proportional to inductance. Inductors, since they work on magnetic fields, can be coupled, as transformers, motors, and generators. A capacitor is a charge device that resists a change in voltage. It is constructed with parallel plates. The equation of a capacitor is ... dv/dt = I/C ... meaning that the rate of change of voltage per time is proportional to current and inversely proportional to capacitance. Inductors and capacitors, since they work in opposite phasor angles, can be coupled to make resonant filters, giving bandpass or bandcut to particular frequencies.
If current drop does it effect the voltage?
Generally, yes. It would depend on the device you are talking about. In a resistor a change in current will result in an instant change in voltage. Inductors and capacitors do not change instantaneously but will over time.
What happens when closing and breaking an inductive circuit?
When you close an inductive circuit, since an inductor resists a change in current, the initial reaction of the load is to look like a high resistance. As current builds, the resistance falls. With a theoretical source and inductor, current would eventually reach infinity, that is after infinite time, but practical sources and inductors will reach a plateau current. When you open an inductive circuit, again, since an inductor resists a change in current, the inductor attempts to maintain that current, but there is no conductivity for that current so, the inductor presents a high voltage spike in the reverse direction it was initially "charged" with. With a theoretical inductor, and theoretical infinite impedance, the voltage spike would be infinite. Again, practical inductors have a maximum voltage spike, but this spike can still be quite high, even thousands of volts, which can damage the circuit, so it is important to maintain a conduction path for the collapsing field, often a diode, or a resistor/capacitor filter.
What is the measure of how strongly a material resists current?
It is simple. Resistance is the measure of how strongly a material resists a current.
What is meant by the term resistance?
What is meant by the term resistivity?
What is the behavior of an inductor?
An inductor resists a change in current. The equation is ... di/dt = V/L ... where di/dt is the rate of change of current in amperes per second, V is the EMF is volts, and L is the inductance in henrys. Looking at this, you can see that the slope of the current is proportional to the voltage and inversely proportional to the inductance. One characteristic of inductors is that when you have a current established, and then break the circuit, the inductor will respond by trying to maintain the current. If this is not possible, such as when the circuit is open, the inductor will generate a large reverse EMF - in the theoretical case, an infinite EMF - in the practical case, several thousand volts, depending on the inductor. This is why proper design of inductors in DC circuits, such as relays and solenoids, must include reverse EMF suppression, such as a diode or resistor across the inductor.
What cause the voltage t lead current in an ac circuit?
Voltage leads current or, more specifically current lags voltage, in an inductive circuit. This is because an inductor resists a change in current.
