The above all assumes you're in the US with 120V supply. If you're elsewhere with a different mains voltage, make sure you use that figure for any calculations.
That said, your amp is unlikely to draw anywhere near 15amp; that would be 1800 Watts, assuming a 120V mains voltage.
That said, your amp is unlikely to draw anywhere near 15amp; that would be 1800 Watts, assuming a 120V mains voltage.