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Digital Electronics - Signals and Switches - Discussion

Discussion Forum : Signals and Switches - General Questions (Q.No. 18)
Signals and Switches
18.
A diode placed in parallel across a relay coil serves what function?
to regulate input voltage
to protect the coil from arcing
to ensure most of the current passes through the coil
to reduce arcing across the relay contacts
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
1 comments Page 1 of 1.
Mr.Perfect said:   1 decade ago
During opening of current carrying contacts in a circuit breaker the medium in between opening contacts become highly ionized through which the interrupting current gets low resistive path and continues to flow through this path even the contacts are physically separated. During the flowing of current from one contact to another the path becomes so heated that it glows. This is called arc.
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