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Potential free contacts (also known as "dry contacts") are simply contacts which are physically operated with the main device, but not electrically connected to it. For example a motor contactor often has auxiliary contacts that are operated by the main coil and open and close at the similar time as the main contacts but are not used for control of the motor starter. If they are connected to an outside circuit to shows the status of the starter without being powered by the motor supply they would be considered potential free contacts.These type also called Signal-Contacts.
In case of relays and switches if the common/pole is connected internally to a given potential like a 110V phase etc., the contact is not POTENTIAL FREE but if both the common and the normal open (and at time also the normally closed) contacts are presented to the user for connecting in his system as he pleases,the contact is said to be "potential-free"
#question.An experminet to prove that a substance is ferrmoanetic
Which gates are known as universal gates? Draw the circuit symbols of n-p-n and p-n-p transistor.
i want more clarification on resultant vectors
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How much pressure produced by 6" diameter cylinder with height of 14" at 95 degrees Celsius
Object-Image Relationships Ray tracing for a thin lens showing the formation of a real image of an object.
Although it needs not concern us further, we also consider that the flow is irrotational. To check for this property, let a tiny grain of dust goes with the fluid. Although this te
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