Voltage Vs Wattage question ? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 6th December 2009, 01:53 AM   #1
diyAudio Member
 
Join Date: Dec 2009
Question 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
  Reply With Quote
Old 6th December 2009, 02:38 AM   #2
llwhtt is offline llwhtt  United States
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
  Reply With Quote
Old 6th December 2009, 02:42 AM   #3
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
  Reply With Quote
Old 6th December 2009, 03:17 AM   #4
diyAudio Member
 
Join Date: Mar 2008
Location: Kansas!
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.
  Reply With Quote
Old 6th December 2009, 03:58 AM   #5
diyAudio Member
 
Join Date: Dec 2009
Quote:
Originally Posted by SpJonesKSU View Post
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
  Reply With Quote
Old 6th December 2009, 09:54 AM   #6
godfrey is online now godfrey  South Africa
diyAudio Member
 
Join Date: Nov 2009
Location: Cape Town
Quote:
Originally Posted by highpow3rpc View Post
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)
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
wattage question rtill Solid State 14 23rd January 2009 11:06 AM
Resistor wattage question DeadSpeaker Solid State 12 17th March 2008 09:41 PM
Does preamp wattage effect power amps wattage? JonnySwitchblade Solid State 7 4th July 2007 03:18 AM
Resistor/LPAD wattage question DerrickM Multi-Way 13 15th April 2007 09:10 AM
power amp into 412 Wattage question twizza Solid State 11 16th June 2005 10:40 AM


New To Site? Need Help?

All times are GMT. The time now is 09:34 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2