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# what is  resistance ?

6 years ago
It is the property of a conductor to resist the flow of charges through it.
plz approve if useful.
Thanks!!!!! I hpoe it helps !!!!!!!!!!!!!!!!!
6 years ago

A force, such as friction, that operates opposite the direction of motionof a body and tends to prevent or slow down the body's motion.

6 years ago
Resistance is a measure of how much an object opposes the passage of electrons. The unit of electrical resistance is the ohm and it is represented by Ω .
plz aprve
5 years ago
Resistance is a measure of how much an object opposes the passage of electrons. The unit of electrical resistance is the ohm and it is represented by Ω .plz aprve
5 years ago
Resistance is a measure of how much an object opposes the passage of electrons. The unit of electrical resistance is the ohm and it is represented by Ω .plz aprve

5 years ago
The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor. The inverse quantity is electrical conductance, and is the ease with which an electric current passes. Electrical resistance shares some conceptual parallels with the notion of mechanical friction. The SI unit of electrical resistance is the ohm (Ω), while electrical conductance is measured insiemens (S).
The resistance (R) of an object is defined as the ratio of voltage across it (V) to current through it (I), while the conductance (G) is the inverse: 5 years ago
The resistance of a conductor is the ratio of the potential difference across its ends to the strength of the current flowing through it.
The SI unit of the Resistance is ohm It is represented by Ω.

Thanks
5 years ago

Resistance is the opposition which a substance offers to flow of electric current. It is represented by letter R. Standard unit of resistance is the ohm.

When an electric current of one ampere passes through a component across which a potential difference (voltage) of one volt exists, then resistance of that component is one ohm.

In general, when applied voltage is held constant, current in a direct-current (DC) electrical circuit is inversely proportional to the resistance. If resistance is doubled, current is cut in half; if resistance is halved, current is doubles. This rule also holds true for low-frequency alternating-current (AC) systems like household utility circuits. In some Ac circuits, at high frequencies, situation is more complex because some components I these systems can store and release energy and dissipating or converting it.

Electrical resistance per unit length, area or volume of a substance is called ‘resistivity’.  Resistivity figures are specified for copper and aluminum wire, in ohms per kilometer.

Opposition to AC but not to DC, is a property known as ‘reactance’. In an AC circuit, resistance and reactance combine vectorially to yield impedance.

Resistance contrasts with conductance, which is a measure of the ease with which electrical current flows through a substance.