January 17, 2014

FCC Technician Exam Question Of The Day (T5D07)

Q) What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?

A) 1.5 amperes

NJ2X Notes:
Ohm's Law was discovered by Georg Simon Ohm and is worth committing to memory:

E = I * R

or by manipulating the terms algebraically:

I = E / R

or

R = E / I

In this example:
I = E / R
I = 120 volts / 80 ohms = 1.5 amperes
Written by: NJ2X, Michael Maher