Do You Understand What Impedance Is?

To pass your electrical exam you’ll need to understand what impedance is and how it operates.

What is impedance?

Impedance is the total opposition to current flow in a circuit.

What is the symbol for impedance?

The letter symbol for impedance is Z.

What is the unit of measure for impedance?                                                                                    

The unit of measure for impedance is the standard unit of measure for resistance, the ohm.

What formula is used to determine impedance? 

Z = \sqrt{R^2 + (X_L - X_C)^2}

What do the symbols in this equation stand for?

Z = Impedance

R = Resistance

XL = Inductive Reactance

XC = Capacitive Reactance

Each of these symbols represent a type of resistance that if present add to the overall resistance of the circuit.

What is inductive reactance and capacitive reactance and which formulas should be used to determine the resistance they bring to the circuit?

Our patient and knowledgeable instructors will help you learn how to properly interpret and answer questions that require an understanding of resistance, inductive and capacitive reactance as well as impedance on your electrical exam.

We specialize in explaining formulas in a way that’s easy to understand and remember. Call 888-919-3926 or click on the “Register Now” tab to begin preparing to pass your exam today.