Voltage Vs Wattage question ?

[highpow3rpc]

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

[llwhtt]

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

[highpow3rpc]

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

[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.

[highpow3rpc]

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]

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)