![]() ![]() In this simple case there probably doesn't seem to be much point in using a gravitational potential energy, but in more complicated calculations it's common to use gravitational potential energy rather than a force. This is now analogous to our equation for the electrostatic work $W=qV$. But we can define a gravitational potential energy $U = gh$ and then write: The SI unit of work per unit charge is the joule per coulomb, where 1 volt 1 joule (of work) per 1 coulomb (of charge).The old SI definition for volt used power and current starting in 1990, the quantum Hall and Josephson effect were used, and in 2019 physical constants were given defined values for the definition of all SI units. ![]() For example when you move up or down a distance $h$ against gravity the work is: You can pull the same trick with regular mechanics. We write $V$ rather than the integral because it's usually more convenient to do so. The emf is not a force at all, but the term ‘electromotive force. A special type of potential difference is known as electromotive force (emf). All such devices create a potential difference and can supply current if connected to a circuit. ![]() It's because $V$ is the integral wrt distance. Voltage has many sources, a few of which are shown in Figure 6.1.1. Where $\Delta V$ is the potential difference between $x_1$ and $x_2$.Īnd that's why the work is just $qV$. In regular mechanics the work done by a force moving from some start point $x_1$ to some end point $x_2$ is: For details and explanations, go through any 11th standard physics book. ![]()
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