The difference between potentials on either side of a resistor is .

Answer

A voltage drop.

Explanation

The difference between potentials on either sides of a resistor is how much the energy of a supplied voltage is reduced when there is flow of electric current through the resistor(a passive element).The potential across the resistor is given as;

V=R×I where V is the Potential energy, R is the Resistance and I is the Electric current

The difference between potentials on either side of a resistor is called voltage drop.

Explanation:

The difference between potentials on either side of a resistor is called voltage drop. The voltage drop across the resistor can be calculated using Ohm's law i.e. multiplying the current flowing in the circuit with the resistance.

In parallel combination of resistor, the potential drop or the voltage drop across the each resistor is same while in case of series combination of resistor the potential drop across the each resistor divides.

car a and b are moving in opposite directions

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the amount of current in the coil