Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω).
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What is the meaning of resistance Wikipedia?
Resistance could mean: The general ability to stop something from happening (Ex. resistance to water means that the object can avoid being hurt by water) Resistance, an ability to reject infection. Electrical resistance, the repulsion of a current in a circuit.
What is resistance explain with example?
Resistance is defined as a refusal to give in or to something that slows down or prevents something. An example of resistance is a child fighting against her kidnapper. An example of resistance is wind against the wings of a plane.
What is resistance of a conductor?
The resistance of a conductor is defined as the ratio of the potential difference across its end to the current flowing through it. Its SI unit is ohm (Ω).
What is resistance and formula?
The formula to calculate the resistance using Ohm’s Law is given as follows: R = V I. where, R is the resistance of the resistor R in ohms (Ω) V is the voltage drop in the resistor in volts.
What is the unit of resistance?
The unit of the electrical resistance, measured with direct current, is the ohm (abbreviated Ω), named after the German physicist and mathematician Georg Simon Ohm (1789-1854). According to ohm’s law, the resistance R is the ratio of the voltage U across a conductor and the current I flowing through it: R = U / I.
What is resistance simple words?
1 : an act or instance of opposing. 2 : the ability to withstand the force or effect of resistance to disease. 3 : an opposing or slowing force The car’s sleek design reduces wind resistance. 4 : the opposition offered by a substance to the passage through it of an electric current.
What causes resistance?
An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance.
What is resistor short answer?
A resistor is an electrical component that limits or regulates the flow of electrical current in an electronic circuit. Resistors can also be used to provide a specific voltage for an active device such as a transistor.
How do you write resistance?
What is the function of resistance?
Resistor is used to resistance the flow of current. When resistor is placed in a circuit, the current flow decreases when current passes through the resistor. The part of current energy dissipate in the form of heat in resistor, thus decrease the total current.
What is resistance SI unit and formula?
The S.I. unit of resistance is ‘ohm’ (volt per ampere). The resistance of a conductor is said to be 1 ohm if a current of 1 ampere flows through it when the potential difference across it is 1 volt.
What is resistance and resistor?
A resistor is an electronic component with a fixed electrical resistance, such as 1 ohm , 10 ohms , 100 ohms , as well as . A conductor’s resistance is its property that influences the amount of current which flows through it when a potential difference is introduced across the ends.
Why resistance is used in circuit?
Resistance serves as an indicator that quantifies how readily current will flow in a circuit using ohms (Ω) as the unit. Current increases when resistance decreases, and it decreases when resistance increases. Resistors are essential in order to ensure that current flows at the appropriate level in circuits.
What is difference between resistance and resistivity?
Resistance is the physical property of a substance because of which it opposes the flow of current i.e. electrons. Resistivity is the physical property of a particular substance which is having particular dimensions.
What is resistance and its properties?
resistance, in electricity, property of an electric circuit or part of a circuit that transforms electric energy into heat energy in opposing electric current. Resistance involves collisions of the current-carrying charged particles with fixed particles that make up the structure of the conductors.
What are different types of resistance?
- Fixed Value Resistors. These are the predominant type of resistor configuration, and as the name suggests, they have a fixed resistance value.
- Variable Resistors.
- Resistor Networks.
- Carbon Film Resistors.
- Metal Film Resistors.
- Wirewound Resistors.
- Metal Oxide Resistors.
- Metal Strip Resistors.
What is resistance and its unit and symbol?
The ohm is the SI unit of electrical resistance. Its symbol is Ω.
What is the SI base unit of resistance?
The ohm (symbol: Ω) is the unit of electrical resistance in the International System of Units (SI). It is named after German physicist Georg Ohm.
Who discovered resistance?
Georg Simon Ohm had humble roots and struggled financially throughout most of his life, but the German physicist is well known today for his formulation of a law, termed Ohm’s law, describing the mathematical relationship between electrical current, resistance and voltage.
What are the 3 units of resistance?
Some of the popular units of resistance include Abohm, megohm, statohm, preece, and planck-impedance.
What is resistance class 11?
The property of a conductor by virtue of which it opposes the flow of electric current through it is called resistance. It is given by the ratio of voltage applied to the electric current which flows through it. R = V/I.
How do you measure resistance?
How is resistance measured? Resistance is measured using an instrument such as an analog multimeter or digital multimeter. Both types of instrument can measure not only resistance, but also current, voltage, and other parameters, so they can be used in a variety of situations.
What is a sentence for resistance?
He went without resistance. The girl yesterday offered no resistance. The same way he wore down her resistance before. The reminder of what he was made her angry and bolstered her resistance.
What is called Ohm’s law?
One of the most basic and important laws of electric circuits is Ohm’s law. Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperatures remain constant.