No voltage drop occurs across a resistor until there is current flow through it. Is this statement true or false?

The statement "No voltage drop occurs across a resistor until there is current flow through it" is true. This is based on Ohm's Law, which states that the voltage across a resistor is directly proportional to the current flowing through it and the resistance, mathematically expressed as V = IR. When there is no current (I = 0), the equation dictates that the voltage (V) across the resistor is also zero.

This concept is fundamental in electrical engineering and circuit analysis, as it helps to understand how resistors function within a circuit. Resistors only create a voltage drop when they are part of a closed circuit and electric current is flowing through them. Thus, only when there is active current will the resistor exhibit a measurable voltage drop.

The other statements either misinterpret the principles of electricity or introduce irrelevant conditions in this context, as the behavior of a resistor in terms of voltage drop is consistently governed by the flow of current, independent of specific resistor types or voltage levels.