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Q: What is a device that controls the flow of current by making or breaking a circuit called?
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What is the difference between the rupturing capacity and the short circuit breaking capacity?

Rupturing capacity:Rupturing capacity or breaking capacity expresses the current that a circuit breaker is capable of breaking at a given recovery voltage under certain set conditions of operation. It is expressed in MVA The set conditions are power factor,recovery voltage and rate of rise of restriking voltage. When the current broken is symmetrical it is called symmetrical breaking capacity. When the current broken is asymmetrical it is called asymmetrical breaking capacity. It is common to designate circuit breaker capacity based on asymmetrical breaking capacity. Breaking capacity of a circuit breaker =√3xVxIx10-6MVA Short circuit breaking capacity: It is the highest value of short circuit current which a circuit breaker is capable of breaking under specified conditions of transient recovery voltage and power frequency voltage. It is expressed in kA. The breaking current is expressed in two ways1)The r.m.s value of a.c component of current at the instant of contact separtation.2)The percentage of d.c component of current at the instant of contact separtation. While selecting the circuit breaker for a particular location in the power system the fault level at that point is determined.


What is a circuit called if its operating and the current is flowing?

This is called a closed circuit. If current was not flowing, it would be open.


A circuit carrying current in one direction is called a?

Direct current circuit.


What safety devices provides a weak link in a circuit that will melt if it received too much current thus breaking the circuit and stopping the flow of electricity?

The device that has a melting link in it is called a fuse.


The opposition to the flow of electrical current?

In a DC circuit . . . resistance. In an AC circuit . . . impedance.


What is a break in an electrical circuit called?

A break in an electric circuit is called an open circuit. Electric current will not flow through an open circuit.


What is a closed path through which current can flow?

A closed path through which a current can flow is called a circuit. Electric Circuit:)


How to measure current?

Current in a circuit can be measured by using a device called ammeter that is always connected in series in the circuit in which current is to be measured.


A device that protects a circuit from current overload is called what?

Fuse, Circuit breaker


What is a circuit with two or more branches for current to flow called?

Parallel circuit


The pathway taken by an electric current is a?

The term is "circuit" (from the same root as circle) An electric circuit must be uninterrupted for the current to flow. (This is why circuit-breakers are also called circuit-interruptors.)


Is the continuous flow of charge in a circuit called direct current?

Direct Current