semi o/t, engineering test creator a hotrod/car guy?

I'm sitting here working on an electrical engineering test p***ed down to me by my boss(electrical engineer) to test my knowledge of current flow and grounding and i come across a question that piqued my interest.

A 1930 Ford Model A horn requires 8 amps of current at 6.3 volts in order to operate. Further, it takes 3 seconds to get the desires "Ah-oo-gh" sound. How much electrical energy is converted to sound in the process?(***ume no losses occur.)


anyway I thought that was kinda cool..


ok back to your regularly scheduled programming

Gray

 

I'd use this to solve it...

​

Thanks

 

As a datum point, a "B" ahoogah becomes an OOOOgah on 12V...the spool-up is so fast it's practically gone, and the horn just ROARS.

 

What if the ahoogah sets off the alarm on a parked car....do we not consider that energy consumption as part of the formula?

 

No, that goes into the entertainment formula; I forget the engineering symbol for electrical energy paid for by someone else...

 

Energy? Somewhere in the neighborhood of 50.4 watts?

 

If no one is around to hear it, does it make a sound?

 

6.3 (volts) X 8 (amps) = 50.4 watts

50.4 (watts) x 3 (seconds) = 151.2 Joules

In imperial units, that is about 36.1 calories

 

I raise you one Erg!

 

36.1 calories, consulting a reference source I just got out of the vending machine, is about 1/8 of a Fifth Avenue candy bar. Mmmmm! Engineering is fun!

 

I got 151 joules as well...just thought it was a cool question since its in the middle of electrical questions...some funny responses, helped make my day a little better.

Gray

 

Damn, I love it so...... (By the way, I appreciate the calorie reference, but keep in mind that dietary calories are really Kcal....)

Thanks for brightening my morning.

 

Hey! Lets keep those Bronto-burgers w/extra sauce out of this!
Somewhere in the dusty time-bin...(50.4 X 3) / 3600 = watt-hours?

 

Agreed.