Question 1151269
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A beginner student may solve the problem in two steps.



<U>Step 1</U>.  &nbsp;&nbsp;Find voltage.  &nbsp;&nbsp;Use the Ohm's law with given &nbsp;I = 4 amperes &nbsp;and &nbsp;R = 3 ohms.


<pre>
         V = I*R = (substitute the given I = 4 amperes and R = 3 ohms) = 4*3 = 12 volts.
</pre>


<U>Step 2</U>.  &nbsp;&nbsp;Find the current.  &nbsp;Use the Ohm's law  in the form &nbsp;&nbsp;I = {{{V/R}}} &nbsp;with the found &nbsp;V = 12 volts &nbsp;and given &nbsp;R = 20 ohms.


<pre>
         I = {{{V/R}}} = {{{12/20}}} = {{{3/5}}} amperes = 0.6 amperes.    <U>ANSWER</U>
</pre>

Solved and explained.