From 1e03ec4e7bb4343dd7632b034c754246e02760e7 Mon Sep 17 00:00:00 2001 From: eggy Date: Wed, 3 Feb 2021 08:59:35 -0500 Subject: [PATCH] phys: clarify interal resistance --- docs/sph3u7.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/sph3u7.md b/docs/sph3u7.md index 913b93a..add7b42 100644 --- a/docs/sph3u7.md +++ b/docs/sph3u7.md @@ -983,7 +983,7 @@ $$\sigma=\frac{1}{\rho}$$ **Electromotive force** (emf, $\epsilon$) is not a force but is the voltage gained when charges pass through a cell, representing the total electric potential energy provided to the whole circuit. -All cells have **internal resistance**, which is the resistance of th cell itself. Where $P$ is the power dissipated in the cell, $I$ is the current the cell produces, and the internal resistance of the cell $r$: +All cells have **internal resistance**, which is the resistance of th cell itself. It is depicted as the resistance being in series with the electromotive force. Where $P$ is the power dissipated in the cell, $I$ is the current the cell produces, and the internal resistance of the cell $r$: $$P=I^2r$$ The voltage across the terminals of a battery is equal to, where $I_r$ is the current across the internal resistance: