What is the formula derived from Ohm's Law to calculate Current?

Ohm’s Law is a fundamental principle in electrical engineering that relates voltage (E), current (I), and resistance (R). The correct formula to calculate current is I = E ÷ R.

In this equation, current (I) is calculated by dividing the voltage (E) by the resistance (R). This relationship indicates that for a given voltage, increasing resistance will result in a decrease in current, and conversely, for a fixed resistance, an increase in voltage will result in an increase in current. Understanding this principle is essential in HVAC systems since many components, such as motors and control boards, rely on precise measurements of voltage and resistance to function effectively.

The other options do not represent the correct relationships as defined by Ohm’s Law, hence they do not accurately express how to calculate current in an electrical circuit.