From 5d4ec5ab360900f81f22a8754d33141ea71e56fc Mon Sep 17 00:00:00 2001 From: Alvie Rahman Date: Thu, 23 Mar 2023 11:54:24 +0000 Subject: [PATCH] add note about exclusion of efficiency from transformer equation --- uni/mmme/2051_electromechanical_devices/transformers.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/uni/mmme/2051_electromechanical_devices/transformers.md b/uni/mmme/2051_electromechanical_devices/transformers.md index bf933dd..7252633 100755 --- a/uni/mmme/2051_electromechanical_devices/transformers.md +++ b/uni/mmme/2051_electromechanical_devices/transformers.md @@ -23,6 +23,8 @@ This coil has a current induced in it by induced magnetic field. $$\frac{i_s}{i_p} = \frac{v_p}{v_s} = \frac{n_p}{n_s} = \text{turns ratio}$$ **Note that the current fraction is s over p, not p over s like the others.** +Transformers have very high efficiency so will not be considered for this module and +has been left out of the equation above. Derivation in lecture slides (pp. 12-15). Transformers are usually described as having a ratio $p:s$, where $p$ is the number of primary coils