Difference Between Resistance and Impedance : In the world of electricity, imagine resistance as a roadblock to the flow of electric current. It's a bit like how traffic faces resistance on the road. Imagine AC circuits like a more dynamic road with twists and turns. Impedance is like the total challenge the current faces, not just roadblocks but also twists and turns.
Resistance is the basic roadblock, slowing things down and turning electrical energy into heat. Impedance includes this roadblock but also considers the tricky parts that make electricity act differently in AC circuits. Understanding this concept not only helps you to understand electric circuits but is also important for NEET preparation.NEET Physics Syllabus | NEET Physics Important Questions with Answers |
NEET Physics Chapter wise Weightage | NEET Physics MCQs |
NEET Physics Notes | NEET Physics Formulas |
Check out the Difference Between Resistance and Impedance based on all the important parameters from the NEET exam point of view. By understanding this will have a clear idea of how current flows in an electrical circuit.
Difference Between Resistance and Impedance | ||
---|---|---|
Parameter | Resistance | Impedance |
Definition | Opposition to the flow of electric current. | Total opposition to the flow of alternating current, considering both resistance and reactance. |
Symbol | ||
Units | Measured in ohms ( Ω ). | It is also measured in ohms ( Ω ). |
Type of Current | Applies to both direct current (DC) and alternating current (AC). | It is primarily associated with alternating current (AC). |
Dependence on Frequency | Independent of frequency. | It depends on frequency; and includes both resistive and reactive components. |
Components | It solely involves resistance, a real component. | Comprises resistance (real) and reactance (imaginary), forming a complex quantity. |
Phasor Representation | Represented by a real number in phasor diagrams. | Represented as a complex number in phasor diagrams, indicating both magnitude and phase. |
Ohm's Law | (Voltage = Current × Resistance). | (Voltage = Current × Impedance), considering both resistance and reactance. |
Energy Dissipation | Energy is dissipated as heat in the resistor. | Energy dissipates as heat in resistive components and is stored and released in reactive components. |
Example | A light bulb's filament has resistance. | A circuit with both resistors and inductors or capacitors has impedance. |
DC Circuit Behavior | Governs the behavior of direct current circuits. | Reactance is not relevant in DC circuits; resistance governs the behavior. |
AC Circuit Behavior | Resistance affects both magnitude and phase in AC circuits. | Impedance considers both resistance and reactance, influencing both magnitude and phase. |
Application | Applied in both DC and AC circuits. | Predominantly used in AC circuits, where reactive components play a significant role. |