vault backup: 2025-10-16 16:08:33

alternating-current.md

@@ -21,8 +21,8 @@ The frequency of the AC power grid in the United States is 60 Hz.
 ## 3-Phase Power
 
 The conductors between a voltage source and a load are called lines,
-and the voltage between any two lines is called line voltage.
-The voltage measured between any line and neutral is called phase voltage.
+and the voltage between any two lines is called **line voltage**.
+The voltage measured between any line and neutral is called **phase voltage**.
 
 * Poles vs Phases vs Wires
 
@@ -34,16 +34,24 @@ The voltage measured between any line and neutral is called phase voltage.
 > * Φ (capital phi)
 > * Ø (latin O with stroke)
 
-208Y/120V
-480Y/277V
+### Formula
 
-In a 3-phase wye connected system,
-ignoring the difference in voltage,
-is voltage drop calculated differently
-between a line to line load and a line to neutral load
+$$
+P = \sqrt{3} \times V_{L} \times I_{L} \times PF
+$$
+
+where:
+
+* $P$ is the power in watts,
+* $V_{L}​$ is the line voltage,
+* $I_{L}$ is the line current,
+* $PF$ is the power factor.
 
 ### Voltage Systems
 
+208Y/120V
+480Y/277V
+
 120/240V 1-Phase 3-Wire:
 * 120V 1-Phase 2-Wire # Line to Neutral
 * 240V 1-Phase 2-Wire # Line to Line