The voltage rise needed to push current through resistance is described by which parameter?

The voltage rise needed to push current through resistance is described by which parameter?

• A. Capacitance
• B. Inductance
• C. Voltage
• D. Impedance

Answer: (C)

Voltage is the driving force that pushes current through a resistor. Ohm's law, V = I R, shows that the current through a resistor is determined by the voltage across it and its resistance. Increasing the voltage rise increases the current in direct proportion to the resistance. Capacitance relates to storing charge and affects current in a capacitor (i = C dv/dt); inductance resists changes in current due to magnetic energy; impedance is the overall opposition to AC current, i.e., the ratio of voltage to current in a circuit. But the specific parameter describing the voltage rise needed to push current through a resistor is simply voltage.

Voltage is the driving force that pushes current through a resistor. Ohm's law, V = I R, shows that the current through a resistor is determined by the voltage across it and its resistance. Increasing the voltage rise increases the current in direct proportion to the resistance. Capacitance relates to storing charge and affects current in a capacitor (i = C dv/dt); inductance resists changes in current due to magnetic energy; impedance is the overall opposition to AC current, i.e., the ratio of voltage to current in a circuit. But the specific parameter describing the voltage rise needed to push current through a resistor is simply voltage.