February 3, 2014

FCC Technician Exam Question Of The Day (T5D11)

Q) What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?

A) 10 volts

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


R = E / I

In this example:
E = I * R
E = 1 ampere * 10 ohm = 10 volts

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