In a parallel circuit, if no changes are made to one resistor, what happens to its voltage drop?

In a parallel circuit, all components share the same voltage across their terminals. This means that each resistor in a parallel arrangement experiences the same voltage drop, which is equal to the voltage supplied by the source. When nothing changes with respect to one particular resistor, such as its resistance or the applied voltage, the voltage drop across that resistor remains constant.

This principle is rooted in Ohm's Law, which states that the voltage (V) across a resistor is equal to the product of the current (I) flowing through it and its resistance (R): V = I × R. In a parallel circuit, changing the conditions of one resistor does not affect the voltage across it if the overall circuit conditions (like supply voltage) remain the same. Therefore, since no changes are made to the resistor in question, the voltage drop across it remains unchanged, resulting in a consistent voltage across that component.