diff --git a/src/main/angular/src/app/editor/parts/battery/Battery.ts b/src/main/angular/src/app/editor/parts/battery/Battery.ts
index 78d1f3f..00071e1 100644
--- a/src/main/angular/src/app/editor/parts/battery/Battery.ts
+++ b/src/main/angular/src/app/editor/parts/battery/Battery.ts
@@ -26,7 +26,7 @@ export class Battery extends Part {
   }
 
   get voltageStr(): string {
-    return siPrefix(this.voltage, 'V', 2);
+    return siPrefix(Math.abs(this.voltage), 'V', 2);
   }
 
   get current(): number {
@@ -34,8 +34,7 @@ export class Battery extends Part {
   }
 
   get currentStr(): string {
-    const current = Math.abs(this.current) || 0;
-    return siPrefix(current, 'A', 2);
+    return siPrefix(Math.abs(this.current) || 0, 'A', 2);
   }
 
 }
diff --git a/src/main/angular/src/app/editor/parts/light/Light.ts b/src/main/angular/src/app/editor/parts/light/Light.ts
index dc0a76a..0e0bad3 100644
--- a/src/main/angular/src/app/editor/parts/light/Light.ts
+++ b/src/main/angular/src/app/editor/parts/light/Light.ts
@@ -39,7 +39,7 @@ export class Light extends Part {
   }
 
   get voltageStr(): string {
-    return siPrefix(this.voltage, 'V', 2);
+    return siPrefix(Math.abs(this.voltage), 'V', 2);
   }
 
   get current(): number {
@@ -50,8 +50,7 @@ export class Light extends Part {
   }
 
   get currentStr(): string {
-    const current = Math.abs(this.current) || 0;
-    return siPrefix(current, 'A', 2);
+    return siPrefix(Math.abs(this.current) || 0, 'A', 2);
   }
 
   fill(): string {
diff --git a/src/main/angular/src/app/editor/parts/relay/Relay.ts b/src/main/angular/src/app/editor/parts/relay/Relay.ts
index d362229..3c6a9fe 100644
--- a/src/main/angular/src/app/editor/parts/relay/Relay.ts
+++ b/src/main/angular/src/app/editor/parts/relay/Relay.ts
@@ -53,7 +53,7 @@ export class Relay extends Part {
   }
 
   get voltageStr(): string {
-    return siPrefix(this.voltage, 'V', 2);
+    return siPrefix(Math.abs(this.voltage), 'V', 2);
   }
 
   get current(): number {
@@ -64,8 +64,7 @@ export class Relay extends Part {
   }
 
   get currentStr(): string {
-    const current = Math.abs(this.current) || 0;
-    return siPrefix(current, 'A', 2);
+    return siPrefix(Math.abs(this.current) || 0, 'A', 2);
   }
 
   override loop(): boolean {