The turns ratio will determine whether the voltage is stepped up, stepped down, or the same as in the primary ( the winding in series with the doorbell ).
12.
It seemed that the manufacturer of such a transformer adjusted the turns ratio to give a slightly high no-load voltage so as to ensure rated voltage at rated current.
13.
A transformer with a turns ratio of 3 : 1 would provide an impedance transformation of 9 : 1, which will match the antenna to a 50-ohm transmission line.
14.
A beneficial side effect is that the output impedance of the valves, and thus the transformer turns ratio needed, is reduced, making it easier to construct a wide bandwidth transformer.
15.
The turns ratio between the primary and secondary coil is selected so that the voltage across the secondary reaches a very high value, enough to arc across the gap of the spark plug.
16.
A transformer with a turns ratio of 5 : 2 would provide an impedance transformation of 6.25 : 1, which will match the antenna to a 75-ohm transmission line.
17.
No load tap changers are often utilized in situations in which a transformer's turn ratio doesn't require frequent changing and it is permissible to de-energize the transformer system.
18.
One or both of the coils usually had several taps which could be selected with a switch, allowing adjustment of the number of turns of that transformer and hence the " turns ratio ".
19.
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.
20.
"a load tap changer ( LTC ) at the substation transformer, which changes the turns ratio in response to load current and thereby adjusts the voltage supplied at the sending end of the feeder;
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