While V = IR is a valid equation that describes the relationship between voltage, current, and resistance in a circuit, it cannot be used to define potential difference (p.d.). This is because potential difference is a measure of the difference in electric potential between two points in a circuit, while V = IR only describes the relationship between voltage and current at a single point in the circuit.
V = IR is a mathematical equation that relates voltage, current, and resistance, while potential difference (p.d.) is a physical quantity that measures the difference in electric potential between two points in a circuit. V = IR is used to calculate the value of p.d. at a specific point in the circuit, but it cannot be used to define p.d. as a whole.
No, p.d. cannot be directly measured using V = IR. While V = IR can be used to calculate the value of p.d. at a specific point in a circuit, it cannot be used to measure the overall potential difference between two points in the circuit.
Potential difference (p.d.) is defined as the difference in electric potential between two points in a circuit. It is measured in volts (V) and is calculated by dividing the work done (in joules) by the charge (in coulombs) that moves between the two points: p.d. = work/charge.
It is important to understand the difference between V = IR and potential difference (p.d.) because these two terms are often used interchangeably, but they have distinct meanings and applications. Confusing the two can lead to incorrect calculations and misunderstandings in circuit analysis. Understanding the difference also allows for a deeper understanding of the fundamental principles of electricity and circuits.