Calculating current

Thread Starter

hannah

Joined Jan 29, 2008
1
I dont get this question , can someone show me how to work it out. casue my teacher did not explain it very well in class!!

In a motor vehicle, a relay is used to switch the 12 V , 60 W headlight on and off.

The resistance of the relay coil is 150 ohms . Calculate the current in the relay coil when it is connected to a 12 V supply.
 

hgmjr

Joined Jan 28, 2005
9,027
beenthere is correct. Here is a link to the AAC ebook section pertaining to Ohm's Law. Reviewing the material and working through the examples shown should help clear up the topic for you.

hgmjr
 

chesart1

Joined Jan 23, 2006
269
Note that the problem asks for the current through the relay coil. Not through the headlight.

You need to look at the circuit. If a circuit was not provided, then you can assume that the relay coil is not connected to the headlight. The relay contacts connect the headlight to 12 volts. Therefore the information about the headlight is not needed to solve the problem.
 

scubasteve_911

Joined Dec 27, 2007
1,203
Is this one of those questions where you are provided more information than you actually need? These always get the people that don't understand the problem and are used to just pluggin in equations :p

Steve
 
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