how does a current depend upon pottential difference and resistance
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Current tends to move through the conductors with some degree of friction, or opposition to motion. This opposition to motion is more properly called resistance. The amount of current in a circuit depends on the amount of voltage and the amount of resistance in the circuit to oppose current flow.
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Explanation
the famous OHM's LAW explains this
current is directly proportional to potential difference across the conductor
I ( current) α V (potential difference)
to remove the proportionality we can multiply with a constant which turns out to be the resistance
Therefore V = I * R
remember that this law is not always valid ...especially in semiconductors and varying temperature condition. This is not a universal law.
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