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A transmitter power amplifier requires 30 mA at 300 volt. The DC input power is:

  a.   300 watt

  b.   9000 watt

  c.   9 watt

  d.   6 watt
Your answer "a" is not correct. "c" is the right answer.

P = E x I
= 300 x 0.03
= 9 watts.

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