ANSWER: one way tie a zener x volts from B+ to ground with a resistor. that gives you a reference voltage using an PNP tie the base to the reference voltage collector goes to the load and the emitter is tied to +B trough a resistor Since the emitter follows the base then the current should be +B volts -zener voltage - Vbe or .6 v. that is it.
Take the internal series resistance of the voltage source and make it the internal parallel resistance of the current source. Then compute using Ohm's law the current of the current source to be equal to the maximum current the original voltage source could supply a short circuit load. Note: the two sources are equivalent.
It's called back EMF or reverse EMF. The EMF is electro-motive force, or voltage. What is happening is that the original current flow creates a magnetic field. That field then induces a voltage that opposes the original voltage that is causing the current flow. This back EMF "resists" the original voltage's efforts to cause current flow. If the created magnetic field did not oppose the original "efforts" of the voltage source to make current flow, then it would aid that voltage to make current flow. We would then get something for nothing and perpetual motion would be possible. We can't do that.
A thyristor will conduct only if enough gate current is present on the gate and enough holding current flow trough it. Once on it will remain on until the holding current is reached then it will not conduct. Since AC is changing polarity it is possible to apply gate current at any time to make it conduct it will turn off when the AC cannot supply the holding current making it an ideal phase controller
Ohm's law: voltage = resistance time current.
It depends on the purpose for installing the resistor. If the intent is to decrease current flow, the resistor must be connected in series with the load. If the purpose is to increase current flow, the resistor must be connected in parallel with the load. To connect a resistor in series, connect the resistor to one side of the power source, in line with the load. This will decrease circuit current flow. To connect a resistor in parallel, connect the resistor between the positive and negative sides of the power source, which will effectively connect the resistor across the load . This will increase current flow through the circuit. However, before connecting a component in parallel, make sure the increase in current flow will not exceed the current rating of the circuit or fuses/breakers will blow.
because the current is regulated rather than the voltage all the motions are controlled by movement that has been programmed. you cant see whats going on with the arc so to make adjustments you have to reprogram the motion after you stop and see what happened. perhaps you can set it for constant voltage and get better results. perhaps constant voltage is better for different materials. most smaller wire feeds are constant voltage which tends to keep the arc length constant. the operator can watch what he doing if he can see the arc and can make all manner of small adjustments. without reprogramming the controls. stick welding is possible because you can watch what you are doing to keep arc length constant the machines are almost always constant current
If you can find a way to resist the pressure and high temperature , in addition to a constant source of water and food , life on Mars will be the same as life on Earth.
Take the internal series resistance of the voltage source and make it the internal parallel resistance of the current source. Then compute using Ohm's law the current of the current source to be equal to the maximum current the original voltage source could supply a short circuit load. Note: the two sources are equivalent.
Voltage attempts to make a current flow, and current will flow if the circuit is complete. It is possible to have voltage without current, but current cannot flow without voltage. The answer is "yes",voltage remains the same as current moves through the circuit.As the voltage remains constant, current increases in the circuit.
Source no, may make possible-yes
Current is defined as the rate of flow of charge through a body. ie, I = Q / T Voltage is the amount of Pressure needed to make the charge flow through the body. ie, V = J / Q A; current flow is not related to time if the EMF is constant the current flow will be constant. A1: current is electrons flow caused by the presence of EMF. A2: voltage is the EMF force necessary to make current or electrons to flow.
The rheostat makes the current high by decreasing the resistance.....and as v=ir.. if r has been decreased and v remains constant than i will increase..
The current is the flow of electrons The voltage is the push the power source gives to the electrons to make the current faster. The flow of electrons is electricity HI!! By the way I am amazing! Trust me.
It is not generally true that current increases when the voltage decreases. Ohms law for a simple resistor says that current is proportional to voltage. However an electric motor supplying a constant mechanical load power will readjust to a lower supply voltage by drawing more current, although if the voltage is progressively reduced the motor would stall. Switch-mode power supplies also tend to draw a constant power from the supply when the input voltage changes.
No, not at all, current can flow between any two opposite poles. Usually a power source and wire are used, but current flows through lightning and such.
Current source means current generator for a circuit. An ideal current source gives all current to the circuit, but practically a current source does n't give all current to the circuit, instead, a source resistor is connected in parallel to the current source to indicate the current drop.
They have in the past, but I am unable to find a current source. There are other manufacturers that make cartridges that can be used in HP printers.