we study ohm's law and we said that it is a relation between "V","I" and "R" : 
Let's see how these equations might work to help us analyze simple circuits :
In the above circuit, there is only one source of voltage (the battery, on the left) and only one source of resistance to current (the lamp, on the right). This makes it very easy to apply Ohm's Law. If we know the values of any two of the three quantities (voltage, current, and resistance) in this circuit, we can use Ohm's Law to determine the third.
In this first example, we will calculate the amount of current (I) in a circuit, given values of voltage (E) and resistance (R) :
What is the amount of current (I) in this circuit ?
In this second example, we will calculate the amount of resistance (R) in a circuit, given values of voltage (E) and current (I) :
What is the amount of resistance (R) offered by the lamp ?
In the last example, we will calculate the amount of voltage supplied by a battery, given values of current (I) and resistance (R):
What is the amount of voltage provided by the battery ?
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