How is current calculated in a DC circuit?

In a DC circuit, current is calculated using Ohm's Law, which states that the current flowing through a circuit is directly proportional to the voltage across it and inversely proportional to the resistance in the circuit. The mathematical expression for this relationship is given by the formula: current equals voltage divided by resistance.

This means that if you know the voltage applied to a circuit and the resistance of the circuit, you can determine the current. For instance, if the voltage is increased while keeping the resistance constant, the current will increase proportionally. Conversely, if the resistance increases while the voltage remains constant, the current will decrease.

Using this formula helps ensure that the relationship between voltage, current, and resistance is correctly applied in circuit design and troubleshooting, making it fundamental knowledge for anyone involved in electrical engineering or amateur radio operations.