How does a transistor amplify ??

[John Popelish]

John Popelish wrote:

But to go downhill just as u told it has to climb very high first [
cross the Reverse bias ] ... how will it do that ???????

Instaed why dosn't it go through the base

(For the NPN case I was describing) The positive collector voltage is
a big downhill (attractive for negative charge electrons emitted into
the base), as it reverse biases the collector-base junction. It is a
well for electrons. On the base side of this junction, holes (doped
into the P base) are pulled away from this depleted region, but
electrons (that pour in from the emitter) are not.

The forward bias across the emitter-base junction (emitter negative
relative to the base) makes the emitter slightly up hill from the
base, for emitter electrons. This bias rolls electrons into the base,
but most of them roll down into the collector well, before they can
make the long, transverse trek to the base connection.