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Why don't we supply to DC to the transformer?

When we give d.c supply to a transformer the primary winding will burn because constent flux will be will be produced which doesnt link with secondary so max current will circulate on primary winding only


Where should a service valve be located in order to isolate the hot supply from the hot water storage vessel to the taps?

primary flow


How do transformers de-energize?

'De-energise' simply means to 'disconnect' or to 'switch off. When you switch off the supply to a transformer's primary winding, it de-energises.


What allows simple transformers to step up or down?

The voltage ratio in transformers used in power supply is set by the ratio of the number of turns on the primary and secondary windings.


How does ignition coil transform low voltage to high voltage?

A: The coil is really a transformer. The 12 enter the coils and charges with current as the point opens up this charge is released as energy about 100 mw. This release is transformed to hi voltage at the secondary by a primary to secondary turn ratio like 1:3333 more or less. Since the primary is open the same ratio will feed the primary that is why we see ringing and the point have capacitor to protect from false firing. <<>> The coil is a transformer, but we know that DC will not work with a transformer. A supply of 12 volts DC is applied to the coil's primary winding. In series with this coil is a set of breaker points. These points are used to interrupt the 12 volt supply from the coil. When the 12 volt supply is interrupted, the magnetic field around the primary winding collapses. This collapsing field induces a voltage into the secondary coil of the transformer. The secondary coil has many more turns that the primary coil and the voltage induced will be in the 10,000 to 15,000 volt range. This high voltage is needed to make the voltage jump across the air gap in the spark plug.