The music system draws a current of 400 mA when connected to a 12 V battery.
What is the resistance of the music system ?

Explanation

To find the resistance of the music system, we can use Ohm's Law, which states:

\[ V = I \times R \]

Where:
- \( V \) is the voltage (in volts),
- \( I \) is the current (in amperes),
- \( R \) is the resistance (in ohms).
...