What is the formula for E derived from the equation P = EI?

The equation P = EI relates power (P), voltage (E), and current (I). In this context, power is defined as the product of voltage and current. To isolate voltage (E) in the equation, it is necessary to manipulate the equation algebraically.

Starting with P = EI, you can derive E by dividing both sides of the equation by I. This leads to the expression E = P / I. This shows that to find voltage, you take the total power and divide it by the current flowing through the circuit.

Therefore, this formulation provides a clear understanding of how voltage is calculated based on power and current, affirming that E increases with higher power for a constant current or decreases when current increases for a constant power output.