Voltage drop is the reduction in voltage caused by current flowing through a resistor. Which option best describes this phenomenon?

Voltage drop is the reduction in voltage caused by current flowing through a resistor. Which option best describes this phenomenon?

• A. The magnetic field around a conductor
• B. The current flowing through a resistor
• C. The supply voltage
• D. The resistance value

Answer: (B)

Voltage drop in a resistor is driven by the current flowing through it. When current passes through a resistor, energy is dissipated as heat and the potential difference from one end to the other becomes smaller. This drop is described by Ohm’s law, V = I × R, meaning the amount of drop depends on both how much current flows and the resistor’s value. The magnetic field around a conductor isn’t what causes the resistor’s voltage drop, the supply voltage is just the source of energy, and while the resistance value influences how large the drop will be for a given current, the fundamental cause of the drop is the current flowing through the resistor.

Voltage drop in a resistor is driven by the current flowing through it. When current passes through a resistor, energy is dissipated as heat and the potential difference from one end to the other becomes smaller. This drop is described by Ohm’s law, V = I × R, meaning the amount of drop depends on both how much current flows and the resistor’s value. The magnetic field around a conductor isn’t what causes the resistor’s voltage drop, the supply voltage is just the source of energy, and while the resistance value influences how large the drop will be for a given current, the fundamental cause of the drop is the current flowing through the resistor.