"The electrical resistance of an object is a measure of its opposition to the flow of electric current."
The opposition to the flow of electric current through a conductor.
Ohm's Law: A fundamental law that describes the relationship between current, voltage, and resistance in an electrical circuit.
Kirchhoff's Laws: A set of laws that govern the behavior of current and voltage in any circuit.
Resistors: Electronic components designed to resist the flow of current in a circuit, causing a drop in voltage across them.
Conductivity: A measure of a materials' ability to conduct an electrical current.
Power Dissipation: The amount of energy lost as heat when current flows through a resistor.
Types of Resistors: An overview of the various types of resistors available, including fixed, variable, and specialized resistors.
Resistor Color Code: A system used to identify the value of a resistor by analyzing its color bands.
Voltage Dividers: A circuit made up of two or more resistors that produce an output voltage that is a fraction of the input voltage.
Network Analysis: A method of analyzing complex circuits made up of multiple resistors and other components.
Wheatstone Bridge: A circuit used to measure an unknown resistance by balancing the circuit.
Thermistors: Temperature-sensitive resistors that can be used in temperature measurement and compensation.
Humidity Sensors: Sensors that use a humid resistor to sense the relative humidity of the surrounding environment.
Photoresistors: Sensors that detect the amount of light falling on them and change their resistance accordingly.
Capacitance: A measure of a materials' ability to store an electrical charge.
Inductance: A measure of a material's ability to store energy in a magnetic field.
Impedance: An extension of resistance that takes into account the effect of capacitance and inductance in a circuit.
Magnetic Inductance: A measure of the resistance an object has to changes in its magnetic field.
Eddy Currents: Currents induced in conductive materials due to changes in a magnetic field.
Skin Effect: The tendency of an alternating current to flow near the surface of a conductor.
Transformer: A device that changes the voltage of an alternating current by using the principle of magnetic induction.
Ohmic resistance: It is the resistance offered by a conductor to the flow of electric current due to its intrinsic characteristics.
Inductive resistance: It is also known as inductance and is the result of the magnetic field generated by the conductor.
Capacitive resistance: It is the result of the capacitance or the ability to store a charge of the conductor.
Reactance: It is the composite effect of both inductive and capacitive resistance in alternating current circuits.
Skin effect resistance: It occurs in high-frequency alternating current when the current tends to flow near the surface of the conductor rather than through it.
Eddy current resistance: It results from the magnetic field generated within the conductor when current flows through it, which induces an opposing current that resists the flow of electric current.
Contact resistance: It occurs when two conductors are touching or have partial contact, leading to a higher resistance in the circuit.
Stray resistance: It is a result of the flow of electric current in unintended conductive paths in a circuit.
Junction resistance: It is the resistance associated with the junction between two different materials or metals in a circuit.
Thermal resistance: It is the resistance offered by a material to the flow of heat through it. It can also affect the electrical properties of a conductor.
"Its reciprocal quantity is electrical conductance, measuring the ease with which an electric current passes."
"The SI unit of electrical resistance is the ohm (Ω)."
"Electrical conductance is measured in siemens (S)."
"Objects made of electrical insulators like rubber tend to have very high resistance and low conductance."
"Objects made of electrical conductors like metals tend to have very low resistance and high conductance."
"The nature of a material is not the only factor in resistance and conductance, however; it also depends on the size and shape of an object."
"These properties are extensive rather than intensive. For example, a wire's resistance is higher if it is long and thin, and lower if it is short and thick."
"All objects resist electrical current, except for superconductors, which have a resistance of zero."
"The resistance R of an object is defined as the ratio of voltage V across it to current I through it."
"The conductance G is the reciprocal [of resistance]."
"For a wide variety of materials and conditions, V and I are directly proportional to each other, and therefore R and G are constants."
"Materials that satisfy Ohm's law are called ohmic materials."
"In other cases, such as a transformer, diode or battery, V and I are not directly proportional."
"The ratio V/I is sometimes still useful, and is referred to as a chordal resistance or static resistance."
"In other situations, the derivative dV/dI may be most useful; this is called the differential resistance."
"The SI unit of electrical resistance is the ohm (Ω)."
"The reciprocal quantity [of electrical resistance] is electrical conductance, measuring the ease with which an electric current passes."
"Objects made of electrical insulators like rubber tend to have very high resistance and low conductance."
"Objects made of electrical conductors like metals tend to have very low resistance and high conductance."