Yes, that's correct. The note "A" (which is used to tune the other strings of the guitar) corresponds to a frequency of 440 Hz.
The formula that links voltage (V), resistance (R) and current intensity (I) is

Solve this formula for I to get

Plug your values for V and R and you'll get the current.
The number of times a standard quantity is present in the given physical quantity is called magnitude of a physical quantity
<span>Compressional forces are the stress that would cause the effect called "Folding".</span>