Conductor definition physics
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A shunt S is connected across it such that… A galvanometer has a resistance of 3663 ω.If it is melted and stretched to 'n' times its original length, its new resistance will be: Find out the following in the electric circuit given in Figure (a) Effective resistance of two 8 Ω resistors in the combination.An AC voltage source of variable angular frequency ωand fixed amplitude….If a wire of resistance R = 10ohm is stretched to double of its length, then new resistance will be:.Two copper wires, one of length 1 m and the other of length 9 m, are found to have the same resistance….How much heat will be developed in 1 minute? An electric current of 3 A passes through a wire of resistance 15 Ohm.
Conductor definition physics full#
A galvanometer with resistance 100 Ω gives full scale deflection with a current of 10 mA….A stone of mass 5 kg falls from the top of a cliff 50 m high and….Important Questions on Current Electricity It is also known as specific electrical resistance. How Do Resistors Work? Electric ResistivityĮlectric resistivity is defined as the electrical resistance offered per unit length and unit cross-sectional area at a specific temperature. In a magnetic field, the resistivity of metals increases but the resistivity of ferromagnetic materials decreases.It is low for metals, more for semiconductors, and high for alloys like nichrome, constantan, etc.Independent of other dimensions like length, area of cross-section, etc. It depends on the nature and temperature of the material.
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Conductor definition physics free#
When a potential difference is applied across the ends of a conductor, the free electrons in it move with an average velocity opposite to the direction of the electric field. The average thermal velocity of free electrons in any direction remains zero. When free electrons in a metal move randomly with a very high speed of the order of 10 5 ms -1. It is a vector quantity and it is in the direction of motion positive charge or flow of current. Current Density refers to the electric current flowing per unit area of a cross-section of a conductor.