Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    2
    ReputationRep:
    In a p-n-p transistor 10^8 electrons enters in emitter in 10^-8 second.if 1% of the electrons are wasted in the base, then what will be the value of COLLECTOR CURRENT and the CURRENT AMPLIFICATION FACTOR?
    • Study Helper
    Offline

    21
    ReputationRep:
    (Original post by Miraz Noor)
    In a p-n-p transistor 10^8 electrons enters in emitter in 10^-8 second.if 1% of the electrons are wasted in the base, then what will be the value of COLLECTOR CURRENT and the CURRENT AMPLIFICATION FACTOR?
    For a PNP bipolar semiconductor, conventional current enters the Emitter and then gets divided between the Base and Collector.

    IE = rate at which charge enters the emitter

    IE = dqE / dt

    dqE = (ne x qe) = 1x108 x 1.60x10-19 = 1.60x10-11 Coulombs

    IE = 1.60x10-11 / 1x10-8 = 1.60 mA

    Current divided in the ratio: 1% base, (100% - 1%) collector = 99% collector

    IB = 0.01 x 1.60x10-3 = 16x10-6 A

    IC = 0.99 x 1.60x10-3 = 1.59x10-3 A

    Because the question does not state the circuit configuration (hence hybrid parameters cannot be invoked at this stage):

    Current gain \beta = IC / IB

    \beta = 1.59x10-3 / 16x10-6

    \beta = 99
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Did TEF Bronze Award affect your UCAS choices?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.