111. A reverse-biased diode has the ________ connected to the positive side of the source, and the ________ connected to the negative side of the source.
(a) cathode, anode
(b) cathode, base
(c) base, anode
(d) anode, cathode
112. The movement of free electrons in a conductor is called
(a) voltage.
(b) current.
(c) recombination.
(d) equilibrium.
113. The term bias in electronics usually means
(a) the value of ac voltage in the signal.
(b) the condition of current through a pn junction.
(c) the value of dc voltages for the device to operate properly.
(d) the status of the diode.
114. Doping of a semiconductor material means
(a) that a glue-type substance is added to hold the material together.
(b) that impurities are added to increase the resistance of the material.
(c) that impurities are added to decrease the resistance of the material.
(d) that all impurities are removed to get pure silicon.
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- Electronics Engineering » PN Junction Diode » Notes 1. When a semiconductor chip contains an N doped region adjacent to a P doped region, a diode junction(often called a PN junction) is formed. Figure-1 : PN Junction Diode 2. The impurities added to an N type region increases the number of electrons capable of conducting charge, while the impurities added to a P type region increase the number of holes that are capable of conducting charge. 3. In a diode, the P material is called the anode. The N material is called the cathode. Figure-2 : Anode & Cathode in PN Junction Diode 4. Diodes are useful because electric current will flow through a PN junction in one direction only. Figure-3 : Direction of Current in PN Junction Diode 5. When the diode is connected so that the current is flowing, it is said to be forward biased. In a forward biased diode, the anode is connected to a higher voltage than the cathode. Figure-4 : Forward Biased PN Junction Diode