The voltage drop in a circuit of known resistance is dependent on

The voltage drop in a circuit of known resistance is dependent on

• A. the amperage of the circuit
• B. the resistance of the circuit only
• C. the supply voltage only
• D. the temperature of the circuit

Answer: (B)

Voltage drop across a resistor follows Ohm’s law: V = I × R. If the resistance is known and remains effectively constant, the only thing that changes the voltage drop across that element is the current flowing through it. So, with a fixed resistance, the voltage drop is determined by how much current passes through the circuit—the amperage. If the current goes up, the drop goes up in direct proportion; if the current goes down, the drop decreases accordingly. Temperature can influence resistance by changing its value, but for a circuit where the resistance is known and treated as constant, the primary factor determining the voltage drop is the current through the resistor.

Voltage drop across a resistor follows Ohm’s law: V = I × R. If the resistance is known and remains effectively constant, the only thing that changes the voltage drop across that element is the current flowing through it. So, with a fixed resistance, the voltage drop is determined by how much current passes through the circuit—the amperage. If the current goes up, the drop goes up in direct proportion; if the current goes down, the drop decreases accordingly. Temperature can influence resistance by changing its value, but for a circuit where the resistance is known and treated as constant, the primary factor determining the voltage drop is the current through the resistor.