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Resistance is the property of a material that _______.
allows the flow of current
opposes the flow of current
generates electricity
converts electrical energy to mechanical energy
opposes the flow of current
Resistance is a physical property of a conductor that opposes the flow of electric current through it. It determines how much current will flow for a given potential difference across the conductor.
Resistance is a physical property of a conductor that opposes the flow of electric current through it. It determines how much current will flow for a given potential difference across the conductor.
Think of resistance like water flowing through a pipe; if the pipe is narrow or contains debris, it becomes harder for the water to flow through, just as a material with high resistance makes it harder for electrons to pass through.
V=I├ЧR тАФ Ohm's Law where V is potential difference, I is current, and R is resistance.
R=╧БALтАЛ тАФ Resistance formula where ╧Бis resistivity, L is length, and A is cross-sectional area.
At the microscopic level, as free electrons move through a conductor, they collide with the atoms or ions of the material. These collisions impede the motion of the electrons, resulting in a loss of kinetic energy and the generation of heat, which manifests as electrical resistance (R).
Resistance is measured in Ohms (╬й).
It is a characteristic property of the material, its length, its area of cross-section, and the temperature.
Higher resistance leads to greater energy dissipation in the form of heat.
Useful in heating appliances like toasters and heaters (Joule heating).
Essential for current limiting and voltage division in electronic circuits.
Energy loss in transmission lines due to heat dissipation.
Limits the efficiency of electrical systems.
Filament bulbs for lighting.
Resistors used in electronic circuit design.
Ohm's law states that VтИЭI provided physical conditions like temperature remain constant.
Option A is incorrect because conductors allow current; resistance is the measure of the friction to that flow.
Option C is incorrect as generators convert mechanical energy to electrical energy.
Option D is incorrect as that describes an electric motor.
B is correct тАФ Resistance is the physical property that opposes the flow of electric current in a conductor.
Remember that resistance is an intrinsic property, whereas current is the flow; always associate resistance with the 'collisions' of electrons with atomic lattice structure.
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