Physics – 4.2.3 Electromotive force and potential difference | e-Consult

Calculation: Power (P) is calculated using the formula P = VI, where V is the potential difference and I is the current. Therefore, P = 12 V * 2 A = 24 watts.

Relationship: The potential difference provides the 'driving force' that causes charges (current) to flow through a circuit. The higher the potential difference, the greater the force on the charges, and thus the larger the current. Power is the rate at which energy is dissipated. It is directly proportional to both the potential difference and the current. A higher potential difference or a higher current will result in a higher power dissipation.