formula to calculate wattage?

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dubb

Copper - Posts: 52

Joined: October 16, 2004

Location: United States

Posted: March 08, 2006 at 6:50 PM / IP Logged

whats that formula to find out exactly how many watts an amp pushes amps..something bout the volts received, fuse ratings..blah..

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coppellstereo

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Joined: November 21, 2005

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Posted: March 08, 2006 at 6:56 PM / IP Logged

https://www.the12volt.com/ohm/page2.asp#power

KPierson

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This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: March 08, 2006 at 8:14 PM / IP Logged

Keep in mind that if you are trying to calculate the power of an amp you'll need to know the effienciency of the amp in question. Also, actual current draw is much more important then fuse size. Just multiplying voltage by current will give you an extremely inflated value of actual real power.

Kevin Pierson

willdkartunes

Copper - Posts: 250

Joined: February 01, 2006

Location: United States

Posted: March 08, 2006 at 9:41 PM / IP Logged

The current draw of an amplifier is usually much lower than the fuse rating on it right? How do you know how much lower it is?

KPierson

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Joined: April 14, 2005

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Posted: March 08, 2006 at 10:43 PM / IP Logged

The only real way to know would be to use a current meter. However, most current meters aren't big enough to measure above ~20A.

Kevin Pierson

willdkartunes

Copper - Posts: 250

Joined: February 01, 2006

Location: United States

Posted: March 09, 2006 at 12:18 AM / IP Logged

There must be a way .... I'll look around for this one. Unless someone else can shed some light on this subject for us ....

Steven Kephart

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Posted: March 09, 2006 at 2:54 AM / IP Logged

If you want to do it right, then you will need an osciloscope and a resistive load.

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jeffchilcott

Platinum - Posts: 2,483

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Posted: March 09, 2006 at 3:00 AM / IP Logged

you can come very close with a clamp style fluke meter or similar and a DMM measure the AC voltage and AC current coming thru your speaker leads

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Steven Kephart

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Posted: March 09, 2006 at 3:55 AM / IP Logged

The down side to that is he won't know the exact point where the amplifier is clipping. But it is probably the next best way to do it.

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formula to calculate wattage?

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