Resistance is defined as what?

• A. Electrical potential or pressure
• B. How much the flow of electric charge is restricted
• C. Electrical frequency of a signal
• D. Electrical impedance to magnetic fields

Answer: (B)

Resistance is the opposition to the flow of electric charge in a conductor. It quantifies how much the movement of electrons is hindered when a voltage is applied. This is why it’s described by Ohm’s law: I = V/R. For a given voltage, higher resistance reduces current; for a given resistance, increasing voltage increases current. The idea is specifically about how freely charges can move, not about the voltage itself, the signal’s frequency, or magnetic-field interactions. In AC discussions, you’ll hear about impedance, which combines resistance with reactive effects, but resistance itself is just the part that restricts current flow.