What is the current in a 12-volt circuit with a 6-ohm resistor connected in series?

To determine the current flowing in the circuit, Ohm's Law is applied, which states that current (I) is equal to voltage (V) divided by resistance (R). In this scenario, the voltage is 12 volts and the resistance is 6 ohms.

Using the formula:

I = V / R

we substitute the given values:

I = 12 volts / 6 ohms = 2 amps.

This calculation indicates that the current flowing through the circuit is indeed 2 amps. Understanding Ohm's Law is fundamental in automotive electrical diagnostics, as it allows you to quantify how voltage, current, and resistance interact in a circuit. By rearranging the formula, you can also solve for voltage or resistance if the other two variables are known, demonstrating the law's versatility in troubleshooting electrical issues.