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What direction current polarity flows from the electrode across the arc to the work?
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Why does the rotation of the motor reversed when change the polarity across the main winding coil?
When changing the auxilary face winding connection the current flow in the winding is changed so that the rotating emf direction is changed . Thats why the motor rotates in opposite direction.
How are the plus and minus voltage signs determined for resistors?
Resistors have no polarity. The voltage across a resistor is determined by the direction of current flowing through that resistor (and vice versa).
Reverse polarity in welding?
Immediate and catastrophic destruction of transistors and/or diodes. While that does not ALWAYS occur, it's certainly possible. Start with the alternator. No doubt those diodes have been destroyed if a battery has been connected with reverse polarity.
Why is it important consider the correct polarity of an electrolytic capacitor when using it in the circuit?
The electrolytic capacitor can only have voltage across it in one direction. Failure to comply will result in catastrophic destruction of the capacitor.
Why moving iron is used in both AC and DC current?
A moving iron instrument works by means of a coil that attracts a moving iron mass that is attached to a pivoted pointer which moves across a graduated scale. The iron mass will be attracted towards the coil, regardless of the magnetic polarity of the coil. So, as an AC current continually reverses the magnetic polarity of the coil, the iron mass is always attracted towards the coil, never repelled by it. Similarly, a moving iron instrument doesn't care in which direction a DC current is flowing. So the instrument works equally well with both AC and DC currents. Moving iron instruments, however, are not as accurate as moving coil instruments which, of course, are sensitive to the direction of current.
Why does the rotation of the motor reversed when change the polarity across the main winding coil?
When changing the auxilary face winding connection the current flow in the winding is changed so that the rotating emf direction is changed . Thats why the motor rotates in opposite direction.
How are the plus and minus voltage signs determined for resistors?
Resistors have no polarity. The voltage across a resistor is determined by the direction of current flowing through that resistor (and vice versa).
Reverse polarity in welding?
Immediate and catastrophic destruction of transistors and/or diodes. While that does not ALWAYS occur, it's certainly possible. Start with the alternator. No doubt those diodes have been destroyed if a battery has been connected with reverse polarity.
What is the necessary to know the polarity of voltage drop across a resistance?
Sometimes it isn't.Another AnswerVoltage drops don't have polarity in the sense of a positive or negative charge. The term 'polarity', when applied to voltage drops, describe the sense or the direction in which that voltage drop is acting within the circuit. The rule is that a voltage drop always acts in the opposite direction to the current which causes it. An example of when it's necessary to know the polarity (direction) of a voltage drop is when applying Kirchhoff's Laws or other network theorems to solve a circuit
Is led a voltage controller or current controller?
An LED is a diode that emits light; diodes allow current to flow only one direction. The voltage applied to the diode attempts to force current to flow in a specific direction. If the voltage polarity is reversed, and current was flowing before (so there was a small voltage drop across the diode), current will cease to flow (assuming the voltage is not too high for the diode to handle), and (almost) all the voltage will be dropped across the diode (a small leakage current may flow, which means some of the voltage will not be dropped across the diode, but this is in the milli or micro range). I would never define a diode as a "voltage controller" or "current controller". It could be either or both, from the above description.
Why is it important consider the correct polarity of an electrolytic capacitor when using it in the circuit?
The electrolytic capacitor can only have voltage across it in one direction. Failure to comply will result in catastrophic destruction of the capacitor.
What is pulsed mig?
In welding technology a Pulsed MIG is a touchless transfer method concerning the electrode and the weld puddle, completed by forming one droplet of metal at the end of the electrode per pulse. Just the right quantity of current is added to drive that one droplet across the arc and into the puddle.
Why moving iron is used in both AC and DC current?
A moving iron instrument works by means of a coil that attracts a moving iron mass that is attached to a pivoted pointer which moves across a graduated scale. The iron mass will be attracted towards the coil, regardless of the magnetic polarity of the coil. So, as an AC current continually reverses the magnetic polarity of the coil, the iron mass is always attracted towards the coil, never repelled by it. Similarly, a moving iron instrument doesn't care in which direction a DC current is flowing. So the instrument works equally well with both AC and DC currents. Moving iron instruments, however, are not as accurate as moving coil instruments which, of course, are sensitive to the direction of current.
Why does voltage develop across an electrode surface?
PINCHE paguina culera putos!
What are AC and DC?
AC and DC are alternating current and direct current, respectively. The two terms generally speak to a voltage source and the way it causes current to flow in a circuit.AC means the applied voltage changes polarity, and, therefore, the current flow in a circuit will change directions in response. The best example is probably the AC power grid, and the grid distributes electric power across a wide area. In the AC power grid, the voltage varies in the form of a sine wave. It varies from zero to a positive peak, back to zero, to a negative peak and back to zero. It actually changes polarity, and this cycle repeats continuously at some rate. The voltage out of the wall socket in a house in the US is AC at 60 Hertz (60 Hz), which is 60 cycles per second.DC means the voltage source has a fixed polarity. Current in a DC circuit will flow in only one direction. The most common example is a battery, and the terminals of this voltage source are positive and negative. The voltage applied to a circuit will result in unidirectional current flow.When we compare DC and AC circuits, we generally consider that in the former, the applied voltage has a fixed polarity and unidirectional current flow. In the latter case, the polarity of the applied voltage changes, and the direction of current flow in an attached circuit will also change.
Why resistor do not have positive or negative terminal?
cuz a resistor is basically a long wire , that resists some of the charges flowing across it. it has resistive properties which stops some of the current from flowing from one terminal to the other. so....as it is just a piece of wire....it doesn't need a +ve or a -ve terminal
List the two conditions under which a diode is operated?
A diode is a semiconductor material which has p region and n region. In order to "turn on" and conduct current in the forward direction, a diode requires a certain amount of positive voltage to be applied across it. An ideal diode conducts only when the diode is forward biased, and then the voltage drop across the diode (Vd) is zero. When the ideal diode is reverse biased, no current flows. The two conditions to operate a diode are: (a) Current flow is permitted; the diode is forward biased. (b) Current flow is prohibited; the diode is reversed biased. When the polarity of the battery is such that current is allowed to flow through the diode, the diode is said to be forward-biased.
