Electronics Engineering
Electrical Engineering

What happens to voltage when a reactor limits current?

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Answered 2012-05-11 20:10:59

the currents path blocks & normal voltage will flow

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What limits current?

The voltage applied and the resistance across it.

Does fuse control voltage or current?

A fuse limits the maximum current through a circuit.

What does a resistor do in an electric circuit?

Limits current flow and drops voltage.

What is the role of a resistor?

To limit the amount of voltage through a circuit.

Does a resister use current?

It may be better to say that a resistor allows current flow through itself rather than to say that a resistor is a device that will "use" current. It does "resist" current flow, and thus limits it to some degree depending on its resistance. (More resistance means more limiting of current flow.) The resistor "drops voltage" as well limits current. A resistor "feels voltage" from some source, and the voltage it "feels" is said to be the "voltage drop" of the resistor. The voltage drop is the voltage that could be measured across that resistor with a meter.

What is the exciter voltage needs to test the generator?

Because the voltage is fixed (within allowable limits) whereas the current varies according to load.

Why voltage is low while using heater as home appliance?

The current is proportionately high as heater requires current to heat the filament.The voltage is deliberately low to sustain the safe power consumption limits.

Purpose of DC shunt reactor?

A DC shunt reactor limits the DC harmonics or ripple seen at the output.

Does voltage regulator increase or decrease the current input?

A DC voltage regulator gives a constant output voltage provided the input voltage is at least 1.5 v higher, up to a given limit. The input current is slightly more than the load current, because a small amoutn of current is needed for the voltage regulator circuit. Check the datasheet of the component which you are using to find the limits. 7805 IC can give upto 1A of current if there is adequete heatsinking.

What is Difference Between Current Source and Voltage Source?

A voltage source provides a voltage, a current source a current. In reality, there is no such thing as an ideal voltage source or an ideal current source. There are usually internal resistances and limits of operation, such as the amount of current a voltage source can provide, or the amount of voltage a current source can provide. Good examples of a voltage source are batteries, generators, and alternators. These all provide a fixed or variable voltage, and have some internal resistance. Batteries perform very much like ideal voltage sources in series with a resistor; generators and alternators have more complex behavior. These simple voltage sources can be turned into a regulated voltage supply with additional electronic components, which can perform very much like an ideal voltage source. There are no simple current sources - a current source needs to be created from electronic components, and must include a voltage source.

What is meant by rated voltage rated current and rated power of a transformer?

The ratings state the limits on voltage and current for operating the transformer at full load. The rated voltage times the rated current gives the rated VA of the transformer. Transormers are not usually rated directly for power because this depends on the power factor of the load applied.

Why are electrical devices rated with both a voltage and a current?

Electrical devices are usually rated with both a voltage and a current in order for the user to determine if the voltage and resulting current is within the limits of the device's capacity to function normally. For example, if a device has a rated voltage of 110Vac then that means that it only needs 110Vac to work. If you use 220Vac, the device will definitely be damaged due to over voltage since the components of that particular device was built around 110Vac and not 220Vac. For the current rating, it is mostly used to determine if the cables of the existing electrical system has the capacity to handle the amount of current produced when the device is used. Most electrical cables and wires have limits as to the amount of current that the conductor can handle. To sum it up, voltage and current ratings are used in order to protect the device and to protect the existing electrical system.

What causes voltage to increase and decrease?

If you are referring to the voltage at your residence, then voltage variation is caused by the changes to the load on your supply network. The network load varies throughout the day, being busiest, for example, around lunchtime and around dinnertime. The resulting load current variation causes the supply voltage to vary (it drops when the load current increases) but, by law, your supplier is obliged to maintain any voltage variation within limits -in the UK, for example, these limits are between +10% and -6% of the nominal 230 V.

What component limits current in a circuit?

A resistor or an inductor. The inductor limits transient current, not steady state current.

Which type of current we are using ac in automobiles?

The only type of current used by automobiles is dc current although the alternator produces ac current which is converted to dc by rectifiers built into the alternator. Even the alternator is controlled by dc current though through the use of a voltage regulator which limits the amount of negative dc sent to the stator and positive dc current sent to the rotor of the alternator which limits the EMF.

What is DC reactor in inverter?

This is used to improve the input power factor of the inverter power supply and reduce harmonics. The ''DC reactor'' is more effective than the input reactor in improving the power factorDC reactors (link chokes) are connected after the input diodes in the power circuit. One of the disadvantage of the DC reactors is they are located after the input diodes, and do not protect the diodes from possible voltage transients. One coil is needed in a DC circuit versus 3 coils in the AC circuit. Additionally DC reactors smoothing the current flow limits the high peak current pulses from abusing the capacitor bank inside the converter.

What is the need of resistor in the experiment of pN junction diode?

The resistor limits current so you can measure voltage across the diode. When you forward bias and saturate a junction, the voltage across it will be constant (0.7 in silicon, for example).

What is the effect of emitter resistance in transistor in common collector?

Limit current through emitter, Often the resistance is the load itself. So the restatnce limits current on what otherwise would act as a voltage follower.

How can a power surge destroy a computer system?

A power surge is a boost in an electrical current flowing through a device such as a computer. A computer system has a maximum amount of power that it can accept through its circuit boards, and when a power surge happens, the circuit boards are stressed beyond these limits. Because the voltage limits were breached, the circuit boards will be fried and the computer system will ultimately be destroyed.

What is an electronic device that limits the amount of current that can flow through it?

A current limiter. Commonly used in well designed power supplies to make the power supply "Fold over" if output current exceeds a safe value. Commonly use a low value resistor in series with the output, and a circuit that senses the voltage across it. Although the above answer describes a circuit to limit current, the device that limits the amount of current flowing through it is a resistor.

How do you determine correct voltage to charge a 6 volt Nicad battery?

NiCad batteries don't charge to a specific voltage. While you would certainly place limits on voltage and current, the primary detection of full charge is to sense the long term slope of the voltage, and to detect the knee point (change in slope) that occurs at full charge.

What is a voltage limiter on a 1971 dodge dart?

there is a porcelain block on the firewall called a ballast resistor that limits voltage to the starter and there is also the voltage regulator that regulates voltage to the battery.

Why are voltage and current characteristics of two different incandescent lamps are different?

You are incorrect to describe voltage and current as being 'characteristics' of incandescent lamps, or any other type of load come to that. Voltage is a characteristic the supply, not by the lamp, while the load current is determined by the power of the lamp which, again, is determined by the supply voltage.A lamp (in fact any type of load) is rated according to the voltage at which it is designed to operate, together with the power it will develop at that voltage. For example, '60 W at 230 V'.A lamp's rated power will only be achieved at its rated voltage. If a voltage below its rated voltage is applied to the lamp, then its resulting power will fall significantly -one of the reasons why utility companies are required to maintain their supply voltages between mandatory limits.

Why clippers are also called limiter?

bcoz, voltage clipping limits the voltage to a device without affecting the rest of the waveform.

What is the nature of the current voltage graph for an unknown resistor?

Fixed-value resistors are normally manufactured so that they obey Ohm's Law -that is, the ratio of their voltage to current remains constant for variations in voltage, within specified limits. In other words, their resistance value remains constant for variations in voltage. This would produce a straight-line curve when plotted. Devices and materials that do not obey Ohm's Law (e.g. semiconductors, etc.) would produce a curved line.

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