Ohm's Law refers to the relationship between the current (I), the voltage (V), and the resistance (R). The battery is basically going to give you the voltage, depending on how many volts it is. The current will be determined by how fast that electrons are traveling, and it will be measured in amps. Lastly, the resistance comes from the resistor which is slowing down the speed of the electrons, and it'll be measured in ohm's. If one is missing then you can mathematically figure the one that is missing by using the other two. For example, if the voltage isn't given, however, you have the current and the resistance, then you can multiply them together and find the voltage.
Using the picture above, it is a pyramid, and from this pyramid we can see the relationships. If we are looking for the one that is missing then we just cover that one and operate the desired function. For example, let's say that we don't know what the resistance (R) is. In that case V/I (voltage divided by current) will give us resistance (R).
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