How can you calculate amperage based on voltage and resistance?

The correct method to calculate amperage based on voltage and resistance is through Ohm's Law, which states that Amperage (I) is equal to Voltage (V) divided by Resistance (R). This foundational principle in electrical engineering enables you to determine the amount of current flowing in a circuit when you know the voltage supplied and the resistance in the circuit.

This relationship showcases how current inversely depends on resistance; as resistance increases, for a constant voltage, the current will decrease. This formula is essential for linemen and electricians to assess circuit behavior and ensure that installations meet safety and operational standards.

Other formulas provided do not correctly represent the relationship needed to calculate amperage directly from voltage and resistance. For instance, calculating amperage using voltage and power instead requires knowledge of power's relationship with current and voltage but does not directly relate to resistance. Understanding these relationships is crucial for effective circuit analysis and troubleshooting in electrical work.