Electrical Engineering ⇒ Topic : Arc volt drop
Arc volt drop. The voltage drop between the anode and cathode comprises the following :
Anode drop. The anode collects the electrons emitted by the cathode and the waiting electrons here form a negative space and the coming electrons are repelled by this space charge. The repelled electrons overcome a certain potential drop which is of tune of about 5V.
Cathode drop. The cathode is bombarded by the positive ions, consequently a high potential gradient is caused due to which a large voltage drop takes place. The cathode drop is about 9 V.
Arc drop. The potential drop in the arc varies from 0.05 V to 0.2 V per cm length of the arc. The average value of this drop can be assumed to' be 0.1V x /, where lis the arc length.Thus total drop equals (5 + 9 + 0.1/)V.
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