Voltage Vs Wattage question ?
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 6th December 2009, 01:53 AM #1 highpow3rpc diyAudio Member   Join Date: Dec 2009 Voltage Vs Wattage question ? Hello all i am new to this forum and would like to ask a question i am a newbie to this forum have had a small amount of experience with electronics but am confused as to why some sites state that for a certain wattage output of an amp you need a minimum voltage is it possible to use higher rated components to deliver more current at the same voltage or does this create interference thanks in advance to all replies
 6th December 2009, 02:38 AM #2 llwhtt   diyAudio Member   Join Date: Jun 2008 Location: SoCal It all depends on the load(speaker), for a given output(wattage) a 16 Ohm load will need a higher voltage,less current than a 4 Ohm load less voltage, more current. This is for solid state only, hollow state(tube) is another matter. Ohms law and various other formulae bare this out. Craig
 6th December 2009, 02:42 AM #3 highpow3rpc diyAudio Member   Join Date: Dec 2009 Say my load is a 4ohm speaker and i want to supply it with 300 watts, how could i get around using a low supply voltage with an amp and what is a good smps that will deliver enough current and voltage for 2 tas5630's
 6th December 2009, 03:17 AM #4 SpJonesKSU   diyAudio Member   Join Date: Mar 2008 Location: Portland OR Little bit of math here, Ohms Law. Voltage = Current * Resistance, V=IR Power = Voltage * Current, P = VI if we sub in V=IR into the power equation, P=VI we can get 2 alternative forms for power. P = I*I*R P = (V*V)/R This is where a given wattage requires a certain amount of voltage into the load, R.
highpow3rpc
diyAudio Member

Join Date: Dec 2009
Quote:
 Originally Posted by SpJonesKSU Little bit of math here, Ohms Law. Voltage = Current * Resistance, V=IR Power = Voltage * Current, P = VI if we sub in V=IR into the power equation, P=VI we can get 2 alternative forms for power. P = I*I*R P = (V*V)/R This is where a given wattage requires a certain amount of voltage into the load, R.
Thank you for this explanation it makes it a lot clearer
I am guessing car amps that produce high wattages run an internal inverter or smps.
a bit off topic but what is a good mosfet amp with crisp audio that can produce alot of power

godfrey
diyAudio Member

Join Date: Nov 2009
Location: Cape Town
Quote:
 Originally Posted by highpow3rpc I am guessing car amps that produce high wattages run an internal inverter or smps.
Quite right.

An amp powered directly by a car battery can only deliver about 5 watts into 4 ohms (or 20 watts for a bridged amp)

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