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Define current gain at a constant V("CE"...

Define current gain at a constant `V_("CE") and V_("BE")`.

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i. The ratio `((I_(C ))/(I_(B)))_(V_("CE"))` is called DC gain `(beta_("dc"))` and `((Delta I_(C ))/(Delta I_(B)))_(V_("CE"))` is called ac signal current gain `(beta_("ac"))` or current amplification factor.
ii. The ratio `((I_(C ))/(I_(E)))_(V_("CE"))` is called DC gain `(alpha_("dc"))` and `((Delta I_(C ))/(Delta I_(B)))_(V_("BE")) = alpha_("ac") ` is called ac gain.
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