What is resistance

It is represented by the uppercase letter R. When an electric current of one ampere passes through a component across which a potential difference ( voltage) of one volt exists, then the resistance of that component is one ohm. Electrical resistance is a measure of the degree to which an object opposes the passage of an electric current. The SI unit of electrical resistance is the ohm. Its reciprocal quantity is electrical conductance measured in siemens. The Next Generation, the Borg.

V is known as the potential difference and is the voltage across the resistor. A measure of the degree to which a substance impedes the flow of electric current induced by a voltage. Good conductors, such as copper, have low resistance. Good insulators, such as rubber, have high resistance.

How to use resistance in a sentence. While a potential difference across the conductor encourages the flow of electrons, resistance discourages it. Resistance causes electrical energy to be dissipated as heat. The rate at which charge flows between two terminals is a combination of these two factors. It is dependent on the nature of the material, its thickness and length, and on temperature.

The standard metric unit for resistance is the ohm, represented by the Greek letter omega. An electrical device having a resistance of ohms would be represented as R = 5. The act or an instance of resisting or the capacity to resist. English dictionary definition of resistance. A force that tends to oppose or retard motion. For a space ship, resistance will counter the thrust of a rocket and keep the rocket from going as fast as it could.

If we make an analogy to water flow in pipes, the resistance is bigger when the pipe is thinner, so the water flow is decreased. The resistance is measured in units of ohms (Ω). The unit of electrical resistance is the ohm and it is represented by Ω. You can see a listing of all my videos a. Copper has a low resistance and wood has a high resistance.

A circuit is a closed loop that allows charge to move from one place to another. Insulin resistance syndrome includes a group of problems like obesity, high blood pressure, high cholesterol, and type diabetes. Resistant definition is - giving, capable of, or exhibiting resistance —often used in combination. What does resistance mean? Oxford Dictionaries as The refusal to accept or comply with something.

The ability not to be affected by something, especially adversely. Logic dictates that, as the price advances towards resistance , sellers become more inclined to sell and buyers become less inclined to buy. A short circuit is an electric circuit offering little or no resistance to the flow of current.

Short circuits are dangerous with high voltage power sources because the high currents encountered can cause large amounts of heat energy to be released. V) is the current going through the object, measured in amperes (A) Calculating resistance. A long and thin wire has more resistance than a short and thick one.