With no load, and 7200 volts on the primary winding, it would have a turns ratio of 7200 / 240 or 30 : 1, and the no load voltage would be 240.
42.
Initially, current begins to flow through the resistor, secondary winding, and base-emitter junction ( see diagram ) which causes the transistor to begin conducting collector current through the primary winding.
43.
No load tap changers are also employed in high voltage transformers in which the system includes a no load tap changer on the primary winding to accommodate system variations within a narrow band around the nominal rating.
44.
A capacitor is placed across the points which absorbs the energy stored in the leakage inductance of the primary coil, and slows the rise time of the primary winding voltage to allow the points to open fully.
45.
Solid-state Tesla coils use the lowest primary operating voltage, typically between 155 and 800 volts, and drive the primary winding using either a single, bipolar transistors, MOSFETs or IGBTs to switch the primary current.
46.
In guitar amplifiers, this flashover problem sometimes occurs if the amplifier is operated without the speakers connected, causing the self inductance of the output transformer primary winding to generate high voltages when the current changes due to the applied signal.
47.
Window-type current transformers ( aka zero sequence current transformers, or ZSCT ) are also common, which can have circuit cables run through the middle of an opening in the core to provide a single-turn primary winding.
48.
As the voltage of the primary winding rises to several hundred volts, the voltage on the secondary winding rises to several tens of thousands of volts, since the secondary winding typically has 100 times as many turns as the primary winding.
49.
As the voltage of the primary winding rises to several hundred volts, the voltage on the secondary winding rises to several tens of thousands of volts, since the secondary winding typically has 100 times as many turns as the primary winding.
50.
:: Correct-both an induction coil and a transformer are essentially the same-both have primary and secondary windings; both have voltage across both windings due to the magnetic field, the field being created by the current in the primary winding.
