Calculate current in shunt resistor

Homework?

If so show your work and answers and someone will hopefully guide you from there...

 

You have one equation and two unkown variables. What is the second equation?

 

This is not as much a mathematics problem as it is science problem. This is exactly why you should not be in trapped by memorizing formulas. You should be deriving all your formulas from definitions and scientific facts. If you cannot derive a formula you shouldn't be using it. Without looking at a formula tell me what happens when you apply a current to two resistances in parallel.

 

Sorry, I think you're missing the point. If all is you want is the answer you can do it using a formula. There are virtually an infinite number of combinations of parts and many types of parts involving inductors, capacitors, transistors, chemical batteries, and so forth, not just resistors. So are you going to memorize different formulas for all these different situations? Memorizing formulas is backwards. You must first understand the physics or the science and then wrap formulas around them. And if you do not understand how a resistor works get a resistor, a battery, and a multimeter and experiment with them. I design circuits for a living. I only rely on what I know about parts and data sheets. I see formulas on data sheets and I do not use them. I wrap my own numbers around the circuits based on what i know. If i relied only on formulas i never would be able to do my job. When I looked at your problem I realized instantly that you lacked understanding of the parts. So I say again that if you don't understand formula and you cannot derive if based on scientific fasts you should not be using it.

 

From the wording of the question I can't tell whether the second equation should be (Im=740 mA) or (Im+Ish=740 mA).

 

Edited because I was being daft.

It's not obvious if the meter is 740mA with the shunt in place or if that's the 'standalone' reading without a shunt.