Electric Horn question

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gogetax1

New Member

• Mar 3, 2013

• #1

hey guys, i have a horn with 12v/510Hz
i want to use it using my 48v/14A battery.
i cant think of a way to get the resistor as a power devider from 48v to 12v for this horn.

any ideas how i calculate that? (i dont know the resistance of the horn)

 

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ccurtis

Well-Known Member

• Mar 4, 2013

• #2

Specs found on the Internet show that it is an electromagnetic automotive horn that uses 6 Amps at 12V. You're looking at one HOT 216 Watt, 6 ohm resistor there fella. Power source is 48 V, Horn is 12 V, resistor voltage is 48-12=36 volts. 36 volts/6 amps = 6 ohms. Power= 6 amps * 6 amps * 6 ohms = 216 watts.

 

G

gogetax1

New Member

• Mar 5, 2013

• #3

ok thanks for the fast reply.. sorry for my slow reply though

so. how many Ohms i need to put before the horn to decrease the voltage from 48 to 12 for this thing to work properly?

 

K

KMoffett

Well-Known Member

• Mar 5, 2013

• #4

Did you read the last sentence of ccurtis's reply?

Ken

 

alec_t

Well-Known Member

Most Helpful Member

• Mar 5, 2013

• #5

The cost of the resistor will probably be greater than that of a 48V horn or a 12V battery .