Using Ohm's Law, how would you calculate the current flow in a circuit with provided resistances and voltage?

To determine the current flow in a circuit using Ohm's Law, the correct approach is to divide the voltage by the total resistance. Ohm's Law states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. This relationship is expressed with the formula:

[ I = \frac{V}{R} ]

In practice, this means that if you know the voltage supplied to the circuit and the total resistance present, you can easily calculate the current by applying the formula stated above.

The other options do not accurately represent the principles of Ohm's Law. For example, multiplying voltage by resistance does not yield a meaningful electrical quantity in the context of calculating current. Furthermore, adding resistance before dividing voltage could be a relevant step when considering series resistances, but without the clear application of Ohm's Law directly indicating the division of voltage by total resistance, this approach would be incomplete or misleading. Lastly, subtracting contact resistance from internal resistance is not a standard calculation in Ohm's Law and does not pertain to finding current in a simple circuit calculation.