Showing posts with label PIE. Show all posts
Showing posts with label PIE. Show all posts

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!

December 27, 2013

FCC Technician Exam Question Of The Day (T5C09)

Q) How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes?

A) 138 watts

NJ2X Notes:
NJ2X PIE Triangle

It is useful to memorize the PIE triangle.  By covering up one variable you get the equation.  So in this example:

P = I * E
P = 10 Amps * 13.8 volts = 138 Watts

Easy as PIE!


December 26, 2013

FCC Technician Exam Question Of The Day (T5C11)

Q) How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts?

A) 10 amperes

NJ2X Notes:
Memorize the PIE triangle to make these types of questions super easy to solve.  Just cover up the desired variable to find the equation:

NJ2X PIE Chart (Power, Current, Voltage)

In this example:

I = P / E
I = 120 watts / 12 vots = 10 amperes

Easy as PIE!


This question is from the FCC Element 2 Technician Class Question Pool
Effective July 1, 2010 for examinations and is valid until June 30, 2014

December 24, 2013

FCC Technician Exam Question Of The Day (T5C10)

Q) How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes?

A) 30 watts

NJ2X Notes:
Memorize the PIE triangle to make this type of question super easy to solve.

NJ2X PIE Triangle (Power, Current, Voltage)

Just cover up the desired variable to find the equation.  In this example:

P = I * E
P = 2.5 amperes * 12 vots = 30 watts

Easy as PIE!