vault backup: 2025-10-31 16:26:48

alternating-current.md

@@ -38,17 +38,31 @@ The voltage measured between any line and neutral is called **phase voltage**.
 
 ### Formula
 
+The formula for active power in a three phase system is given by
+
 $$
 P = \sqrt{3} \times V_{L} \times I_{L} \times PF
 $$
 
 where:
 
-* $P$ is the power in watts,
+* $P$ is the active power,
 * $V_{L}​$ is the line voltage,
 * $I_{L}$ is the line current,
 * $PF$ is the power factor.
 
+The formula for apparent power in a three phase system is given by
+
+$$
+S = \sqrt{3} \times V_{L} \times I_{L}
+$$
+
+where:
+
+* $S$ is the apparent power,
+* $V_{L}​$ is the line voltage,
+* $I_{L}$ is the line current.
+
 ### Voltage Systems
 
 208Y/120V