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Why rotor contactor in external resistance of slipring motor connected in delta?
rotor contactor are used to cut the resistance in slip-ring motor connected through resistance box. resistance is proportional to torque. so by controlling rotor contactor resistance can be controlled and hence torque can be controlled. for more information check torque and speed characteristic of wound motor.
Why is the rotor winding of a synchronous motor connected to an external resistance during start up?
because at start the motor draws larger quantity of current and this may affected the rotor windings in order to limit current always resistance is connected.
What is the difference between external stress and emotional stress?
External is out side emotional is in
What happens when an electric current encounters resistance?
An electron traveling through the wires and loads of the external circuit encounters resistance.
What allows current to pass in an AC circuit in spite the presence of dielectric in the capacitor?
There are two types of electric current: 'conduction current' and 'displacement current'. Normal current flow, for example, electron flow in a metal conductor, is an example of 'conduction current'.'Displacement current' takes place within dielectrics, such as the dielectric that separates the plates of a capacitor. When a potential difference is applied across a dielectric, the majority of electrons cannot move as they are tied to their individual atoms. However, the shape of the electron orbits around their nucleii, become distorted or elongated ('polarised'), with their 'negative centre' attracted towards the external positive potential, and their 'positive centre' attracted towrds the external negative potential. Whenever the magnitude of the external potential difference changes, so too does the amount of distortion of the electron orbits. We call this a 'displacement current', and it only occurs when the potential difference applied to the dielectric changes. As a.c. potential difference is continually changing in magnitude and direction, so too does the resulting displacement current.So, when we apply a.c. voltage to a capacitor, a displacement current takes place within the dielectric, while a conduction current takes place around the external circuit.
Can you find the potential difference when the charge is moving with external force?
ya:-):) because the charge q is proportional to potential difference
When does Internal resistance equals external resistance?
If Rin = Rout, then the voltage at the output of the device goes down to half of the value that the circuit has without the external resistance. Scroll down to related links and look at "Interconnection of two audio units".
Why terminal potential difference is decrease when current in the circuit is increased?
The terminal potential difference decreases when the current in the circuit is increased due to the internal resistance of the power source. As the current increases, the voltage drop across the internal resistance also increases, leading to a decrease in the terminal potential difference available to the external circuit. This is described by Ohm's Law, V = E - Ir, where V is the terminal potential difference, E is the electromotive force of the source, I is the current, and r is the internal resistance.
What is the type of energy that comes out of a battery?
Potential chemical energy is released as electrical energy when the external circuit is connected.
What is practical voltage source?
in case of ideal voltage source we consider the internal resistance to be zero.but in practical,every battery has some internal resistance then if you connect a load resistance across the terminals of that source,the net potential difference's across the voltage source will be a function of external resistance connects it won't give constant voltage across it's terminals.
Why the rotor winding of a synchronous motor is usually connected to an external resistance during start up?
because at start the motor draws larger quantity of current and this may affected the rotor windings in order to limit current always resistance is connected.
Why rotor contactor in external resistance of slipring motor connected in delta?
rotor contactor are used to cut the resistance in slip-ring motor connected through resistance box. resistance is proportional to torque. so by controlling rotor contactor resistance can be controlled and hence torque can be controlled. for more information check torque and speed characteristic of wound motor.
Why is the rotor winding of a synchronous motor connected to an external resistance during start up?
because at start the motor draws larger quantity of current and this may affected the rotor windings in order to limit current always resistance is connected.
What does an external hardrive do?
An external hard drive is a device similar to your computer's hard drive. The difference is that it is portable. You can save files on it and it can be connected to most other computers.
Does a Resistor have a different resistance when connected to a power source vs if the resistance is tested when the resistor is out of circuit?
No, the resistance of a resistor remains the same whether it is connected to a power source or tested out of circuit. The resistance value is an intrinsic property of the resistor and does not change based on the external conditions.
When checking resistance does the power have to be off?
Short answer: yes. Most modern multimeters will not be damaged by external power when measuring resistance. But they will give erroneous readings. It is best to remove the power and disconnect the measured resistance from the larger circuit. A multimeter determines resistance by applying a small voltage, and measuring the resulting current. If the resistor has an external voltage source, then it will interfere with the measurement. Furthermore, if the resistance is connected to a larger circuit, then the resistance of this larger circuit will also be involved.
What is difference between internal modem and external modem on the basis of UART and price?
An internal modem is housed within the main computer. An external modem is on the outside of the computer and connected to the computer with a cable.
