diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index 986dcc8aea11..80f42a31fdad 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -179,8 +179,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/Felix/Configuration.h b/Marlin/example_configurations/Felix/Configuration.h
index 5d81313d7356..104033ab5296 100644
--- a/Marlin/example_configurations/Felix/Configuration.h
+++ b/Marlin/example_configurations/Felix/Configuration.h
@@ -179,8 +179,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/Felix/Configuration_DUAL.h b/Marlin/example_configurations/Felix/Configuration_DUAL.h
index b36cdfcd740b..2c384228cb0b 100644
--- a/Marlin/example_configurations/Felix/Configuration_DUAL.h
+++ b/Marlin/example_configurations/Felix/Configuration_DUAL.h
@@ -168,8 +168,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/Hephestos/Configuration.h b/Marlin/example_configurations/Hephestos/Configuration.h
index e7dd934e3192..d372ce95de9b 100644
--- a/Marlin/example_configurations/Hephestos/Configuration.h
+++ b/Marlin/example_configurations/Hephestos/Configuration.h
@@ -182,8 +182,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/Hephestos_2/Configuration.h b/Marlin/example_configurations/Hephestos_2/Configuration.h
index 23cb359ba794..e244777eaa3a 100644
--- a/Marlin/example_configurations/Hephestos_2/Configuration.h
+++ b/Marlin/example_configurations/Hephestos_2/Configuration.h
@@ -180,8 +180,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/K8200/Configuration.h b/Marlin/example_configurations/K8200/Configuration.h
index ee5ab3f594bb..6fdc9f076fed 100644
--- a/Marlin/example_configurations/K8200/Configuration.h
+++ b/Marlin/example_configurations/K8200/Configuration.h
@@ -184,8 +184,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
index 422575a1e124..377afdf4f2c2 100644
--- a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
+++ b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
@@ -179,8 +179,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/RigidBot/Configuration.h b/Marlin/example_configurations/RigidBot/Configuration.h
index 100dc6d8aae5..569e39b81a13 100644
--- a/Marlin/example_configurations/RigidBot/Configuration.h
+++ b/Marlin/example_configurations/RigidBot/Configuration.h
@@ -179,8 +179,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/SCARA/Configuration.h b/Marlin/example_configurations/SCARA/Configuration.h
index 5b5fe1ed5757..a663f5230fa7 100644
--- a/Marlin/example_configurations/SCARA/Configuration.h
+++ b/Marlin/example_configurations/SCARA/Configuration.h
@@ -204,8 +204,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-#define EXTRUDER_WATTS (2*2/5.9) //  P=I^2/R
-#define BED_WATTS (5.45*5.45/2.2)      // P=I^2/R
+#define EXTRUDER_WATTS (2*2/5.9)       // P=U^2/R
+#define BED_WATTS (5.45*5.45/2.2)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/TAZ4/Configuration.h b/Marlin/example_configurations/TAZ4/Configuration.h
index 8b08209c1908..e234570a91b5 100644
--- a/Marlin/example_configurations/TAZ4/Configuration.h
+++ b/Marlin/example_configurations/TAZ4/Configuration.h
@@ -179,8 +179,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/WITBOX/Configuration.h b/Marlin/example_configurations/WITBOX/Configuration.h
index ba1d3923b630..84c42c0ff17f 100644
--- a/Marlin/example_configurations/WITBOX/Configuration.h
+++ b/Marlin/example_configurations/WITBOX/Configuration.h
@@ -182,8 +182,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/adafruit/ST7565/Configuration.h b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
index 4cbb4a66bdcb..96877a10a09f 100644
--- a/Marlin/example_configurations/adafruit/ST7565/Configuration.h
+++ b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
@@ -179,8 +179,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/delta/biv2.5/Configuration.h b/Marlin/example_configurations/delta/biv2.5/Configuration.h
index 393fb8307de6..5b5eaea59634 100644
--- a/Marlin/example_configurations/delta/biv2.5/Configuration.h
+++ b/Marlin/example_configurations/delta/biv2.5/Configuration.h
@@ -179,8 +179,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/delta/generic/Configuration.h b/Marlin/example_configurations/delta/generic/Configuration.h
index 48efa7cda6d7..d4ca7ed30de2 100644
--- a/Marlin/example_configurations/delta/generic/Configuration.h
+++ b/Marlin/example_configurations/delta/generic/Configuration.h
@@ -179,8 +179,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/delta/kossel_mini/Configuration.h b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
index ea21a4b42a9f..3fbc9d34c73a 100644
--- a/Marlin/example_configurations/delta/kossel_mini/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
@@ -179,8 +179,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/delta/kossel_pro/Configuration.h b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
index 54a9bcb4c128..d773bdc7571e 100644
--- a/Marlin/example_configurations/delta/kossel_pro/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
@@ -183,8 +183,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/delta/kossel_xl/Configuration.h b/Marlin/example_configurations/delta/kossel_xl/Configuration.h
index 52141186521c..af72ca4665f3 100644
--- a/Marlin/example_configurations/delta/kossel_xl/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_xl/Configuration.h
@@ -202,8 +202,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/makibox/Configuration.h b/Marlin/example_configurations/makibox/Configuration.h
index cf8aa8fb53db..ad4afeadeee1 100644
--- a/Marlin/example_configurations/makibox/Configuration.h
+++ b/Marlin/example_configurations/makibox/Configuration.h
@@ -179,8 +179,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
diff --git a/Marlin/example_configurations/tvrrug/Round2/Configuration.h b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
index f24d1fac9071..ef81cb828c72 100644
--- a/Marlin/example_configurations/tvrrug/Round2/Configuration.h
+++ b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
@@ -179,8 +179,8 @@ Here are some standard links for getting your machine calibrated:
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) //  P=I^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=I^2/R
+//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================