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The current gain for common emitter ampl...

The current gain for common emitter amplifier is 69. If the emitter current is `7.0 mA`, find (i) base current and (ii) collector current.

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`beta=I_c/I_b or I_c=betaI_b=69I_b`
`I_(e)=I_b+I_c=I_b+69I_b=70I_b`
`:.7.0=70I_(b) or I_(b)=7.0/70=0.1 mA`
`I_(c)=I_(e)-I_(b)=7.0-0.1=6.9 mA`
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