January 1, 2014

FCC Technician Exam Question Of The Day (T5C08)

Q) What is the formula used to calculate electrical power in a DC circuit?

A) Power (P) equals voltage (E) multiplied by current (I)

NJ2X Notes:
There is a really excellent method for memorizing the various power/voltage/current relationships called simply the "PIE" method or also the "Power Triangle".

NJ2X PIE chart for finding the relation between power, current, and voltage

To use this, memorize drawing a triangle with the letter PIE arranged as above which stand for Power (P), Current (I), and Voltage (E) .  Then cover any letter to find the formula (see above).  Presto magico - easy as PIE!