Analog Electronics
In MOSFET devices the N-channel type is better the P-channel type in the following respects

  it has better noise immunity.
  it is faster.
  it has better drive capability.
  it is TTL compatible.

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Analog Electronics
The arrowhead on the transistor symbol points in the direction of

  majority carrier flow in the emitter region.
  electron flow in the emitter region.
  minority carrier flow in the emitter region.
  conventional electric current flow in the emitter region.

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