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  • Ramani Aswath
    Ramani Aswath

    @ramani-VR4O43 • Aug 17, 2012

    The coil of the relay is inductive. When the relay is switched off a reverse voltage will appear across the terminals. This may cause some damage or disturbance to the rest of the circuits. A reverse biased diode across the coil shorts out this spike.

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  • fisfiseani
    fisfiseani

    @fisfiseani-dRQYm1 • Aug 17, 2012

    bioramaniThe coil of the relay is inductive. When the relay is switched off a reverse voltage will appear across the terminals. This may cause some damage or disturbance to the rest of the circuits. A reverse biased diode across the coil shorts out this spike.

    Thanks for your answer sir.

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  • Harshad Italiya
    Harshad Italiya

    @harshad-ukH5ww • Aug 17, 2012

    It is also called Freewheeling Diode :- <a href="https://en.wikipedia.org/wiki/Flyback_diode" target="_blank" rel="nofollow noopener noreferrer">Flyback Diode</a>

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  • ravi sidhu
    ravi sidhu

    @ravi-sidhu-Spa8xw • Aug 26, 2012

    Relays are work on physical mutual Induction process its need some time our required time hence in case of diode no need of physical contact and also no need of protecting layer,and use is easy and no need of higher voltage to operate it occuracy more

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