SOLUTION: Ohm's law states that V=IR for a simple circuit, where V is the total voltage, I is the amount of current running through the resistor and R is the resistance of the resistor. If I

Algebra ->  Proportions -> SOLUTION: Ohm's law states that V=IR for a simple circuit, where V is the total voltage, I is the amount of current running through the resistor and R is the resistance of the resistor. If I      Log On


   

Question 1151269: Ohm's law states that V=IR for a simple circuit, where V is the total voltage, I is the amount of current running through the resistor and R is the resistance of the resistor. If I=40 amperes when R=3 ohms, find the amount of current (in amperes) when the resistor has a resistance of 20 ohms. Assume voltage remains constant
Answer by ikleyn(52776) About Me  (Show Source):
You can put this solution on YOUR website!
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A beginner student may solve the problem in two steps.


Step 1.   Find voltage.   Use the Ohm's law with given  I = 4 amperes  and  R = 3 ohms. 

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


Step 2.   Find the current.  Use the Ohm's law in the form   I = V%2FR  with the found  V = 12 volts  and given  R = 20 ohms. 

         I = V%2FR = 12%2F20 = 3%2F5 amperes = 0.6 amperes.    ANSWER

Solved and explained.