Considering the Ohm's law, the correct answer is option d): the minimum resistance is 8 ohms.
Current is the physical quantity that expresses the amount of electricity that flows through a conductor in a unit of time. It is measured in amps.
The voltage is the difference that exists between the electrical charge that leaves the source and with which it finally reaches the end of the circuit. It is expressed in volts.
Finally, resistance is the difficulty that a circuit opposes to the passage of a current. They are measured in ohms.
Ohm's Law relates the magnitudes of voltage, resistance, and intensity. Ohm's law says that "the intensity of the electric current flowing through an electric conductor is directly proportional to the applied potential difference and inversely proportional to its resistance".
Mathematically Ohm's law is expressed as:
[tex]I=\frac{V}{R}[/tex]
Then, knowing the intensity and the voltage, it is possible to calculate the resistance as follows:
[tex]R=\frac{V}{I}[/tex]
In this case, you know:
Replacing in Ohm's Law:
[tex]R=\frac{120 V}{15 A}[/tex]
Solving:
R= 8 ohms
Finally, the correct answer is option d): the minimum resistance is 8 ohms.
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