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Answered 2005-05-11 06:09:31


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What voltage is used for control circuits?


What is the voltage that supplies a motor starter called?

In the electrical trade it is called control voltage. This voltage can be any voltage. In North America the common control voltage is 120 volts.

What are the advantages and disadvantages of voltage resistance control?

With voltage control there is so much voltage drop due to resistor, that's the disadvantage

What is the difference between current control devices and voltage control devices?

The difference between a current control device and voltage controlled device is that for current controlled device, the current is constant and the voltage is variable while for a voltage controlled device, the voltage is constant and the current is variable.

What would the control voltage be for a transformer marked 240v 24vac?

A control transformer marked 240V - 24Vac would have a control voltage of 24 volts.

How does voltage control change speed of electric motor?

== == voltage in the windings does NOT control the speed of a motor, but the armature voltage does. on DC motors speed can controlled by varying the resistance of the field winding or the armature voltage

How to control the high voltage control in an industry?

Voltage stabilisers are the devices to control voltage. These are of 3 types i.e. VARIAC BASED,IGBT BASED and THERMISTOR TYPE. These are classified according to voltage correction speed i.e. from 70 volt/second to 750 volt/seconds.

Explain the rheostat and its advantages in electric circuits?

Advantages in electric circuits : Advantages of using the rheostat in electric circuits is optional as you could just use the dial on the power-supply to vary the voltage (p.d.), and therefore the current. The advantage of using the rheostat is that you can control it to give you nice even numbers for the voltage.

Where are resistors placed to control voltage and current?

A: A RESISTOR is a passive component it cannot control voltage these components and/or current it can however limit

What voltage segregation is required within panels?

Between power and control voltage circuits

How do you control voltage and power factor for alternator?

Since it the rate at which the flux is cutting the conductor determines the (EMF) electromotive force which is the voltage, the best way to control voltage is to adjust the speed of the engine through the governor, coupled with an automatic voltage regulator.

Is BJT is a current control device or voltage control device?

100% its a current control device no doubt in it

Why Normal time-overcurrent relays are not adequate for generator backup protection?

Setting the time-overcurrent relays high enough to prevent tripping for normal overloads may result in them not tripping at all due to the decaying characteristic of the generator fault current. Using the system voltage to control the overcurrent characteristic resolves this problem, since the voltage should drop very little for overloads, but will collapse to a small value for external faults. The 51V protection function uses the system voltage to adapt the operation of a time overcurrent element, using either voltage-restraint (51VR) or voltage-control (51VC).

What method is used to control the voltage of an aircraft alternator?

Aircraft alternators have an electronic voltage regulator.

Where is the voltage regulator in 1998 Dodge truck?

The engine control module acts as the voltage regulator.

How does a voltage controlled amplifier work?

A Voltage Controlled Amplifier or VCA is a device whose gain is set by the voltage level of a control signal.

Is thyristor a current controlled or voltage control device?

Triac is the current control device.

Are the terms voltage limiter and voltage regulator interchangeable?

No. A voltage regulator usually can provide control in both directions (increasing or decreasing voltages). A voltage limiter clamps the voltage to below a specific level.

Different methods to control speed of dc motor?

armature control method field flux control voltage control method

Could over-current be caused by low voltage?

No, not directly. The supply voltage has to rise or the resistance has to fall to get over-current. If there was a secondary control voltage that was part of a voltage control circuit for a higher voltage, it is conceivable that a voltage drop in control circuit could cause an over-voltage in the supply. Motors are constant power devices, so this could be true for a motor. If you have a 1hp motor (loaded at 1hp), it will want to draw 1hp of power no matter the supply voltage. If the voltage dips, the motor will require more current to keep it spinning at it's normal speed.

Principle of inverter?

voltage control tech.of inverters??

What is a vrm used for?

To control the amout of voltage to the processor

How can you control the PWM output voltage?

Obviously by feedback

What is control voltage in a gas furnace?

24 volts

Why do Headlight go dim?

Could be a bad ground circuit Could be weak battery or alternator not supplying adequate voltage