12v consumption

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mrconcept

Member - Posts: 3

Joined: May 30, 2008

Location: Quebec, Canada

Posted: June 01, 2008 at 9:49 PM / IP Logged

I'm trying to find a way to know if I put one 55W fog light on a 12v batterie that as 18 amps/hour how long is the light going to last if the battery is not recharged will the motor runs. Thank's for your answers.

MR Concept

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Big Dog

Gold - Posts: 1,265

This member consistently provides reliable information

Joined: May 02, 2002

Location: Quebec, Canada

Posted: June 04, 2008 at 2:42 PM / IP Logged

The short answer: max 4 hours (non linear obviously). Usuable might be 2 hours.

The long answer:

R=V^2 / W

R=144 / 55

R=2.62 ohms

Thus . . .

I=V / R

I=12 / 2.62

I=4.58

18 / 4.58 = 3.93 hours

Prepare your future. It wasn't the lack of stones that killed the stone age.

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mrconcept

Member - Posts: 3

Joined: May 30, 2008

Location: Quebec, Canada

Posted: June 04, 2008 at 7:09 PM / IP Logged

Thanks it's really appreciated

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12v consumption

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