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terminal voltage

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terminal voltage

Potential difference (pd) or voltage across the terminals of a power supply, such as a battery of cells. When the supply is not connected in circuit its terminal voltage is the same as its electromotive force (emf); however, as soon as it begins to supply current to a circuit its terminal voltage falls because some electric potential energy is lost in driving current against the supply's own internal resistance. As the current flowing in the circuit is increased the terminal voltage of the supply falls.



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First, motor terminal voltage during starting (and therefore the torque) will vary with total circuit impedance, which is not constant throughout acceleration, nor is it the same for all motors.
The basic requirement is that the excitation system supplies and automatically adjusts field current of the synchronous generator to maintain terminal voltage as the output varies within the continuous capability of generator's U-curves.
 
 
 
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