1. The problem is to understand how to solve or use an ammeter in an electrical circuit. 2. An ammeter is a device used to measure the current flowing through a circuit. The key formula related to current is $I = \frac{Q}{t}$, where $I$ is current, $Q$ is charge, and $t$ is time. 3. Important rules for using an ammeter: - Always connect the ammeter in series with the circuit element whose current you want to measure. - The ammeter has very low internal resistance to avoid affecting the circuit. 4. To solve a problem involving an ammeter, identify the current path, connect the ammeter in series, and use Ohm's law $V = IR$ if needed to find current, where $V$ is voltage and $R$ is resistance. 5. Example: If a circuit has a voltage of 12 volts and a resistance of 4 ohms, the current measured by the ammeter is $$I = \frac{V}{R} = \frac{12}{4} = 3\text{ amperes}.$$