Which of the following is a measure of a material's opposition to the flow of electric current?

The measure of a material's opposition to the flow of electric current is known as resistance, which is quantified in ohms. Resistance is a fundamental electrical property that illustrates how much a material hinders the movement of electrons, thereby affecting how much current flows for a given voltage. The higher the resistance (measured in ohms), the less current will flow through the material for a particular voltage, according to Ohm's Law (V = I * R). This relationship is critical in electrical engineering and applications where ensuring proper current flow is essential, such as in circuit design and safety considerations.

In contrast, volts measure the electric potential difference, watts measure the rate at which electrical energy is consumed or converted, and amps measure the flow of electric current itself. Each of these metrics provides important information about electrical systems, but none serves as the measure of opposition to current flow. This makes ohms the correct choice for representing resistance in electrical contexts.