diff --git a/src/domain/entities/Resistor.js b/src/domain/entities/Resistor.js
index 6dbc0fa..1478c55 100644
--- a/src/domain/entities/Resistor.js
+++ b/src/domain/entities/Resistor.js
@@ -1,9 +1,23 @@
-// src/domain/entities/Resistor.js
-export class Resistor {
-    constructor(id, position, resistance) {
-        this.id = id;
-        this.type = 'resistor'; // Used for rendering or logic
-        this.position = position; // Position value object
-        this.resistance = resistance; // Resistance value object
+import { Element } from './Element.js';
+import { Properties } from '../valueObjects/Properties.js';
+
+/**
+ * Represents a Resistor in the circuit.
+ */
+export class Resistor extends Element {
+    /**
+     * Creates an instance of Resistor.
+     * 
+     * @param {string} id - The unique identifier for the resistor.
+     * @param {Position[]} terminals - The two terminal positions for the resistor.
+     * @param {Label|null} label - The label of the resistor (optional).
+     * @param {Properties} properties - A container for the resistor's properties, including resistance.
+     */
+    constructor(id, terminals, label = null, properties = new Properties({ resistance: "undefined" })) {
+        if (terminals.length !== 2) {
+            throw new Error("A Resistor must have exactly two terminals.");
+        }
+        super(id, terminals, label, properties);
+        this.type = 'resistor';
     }
 }
diff --git a/src/domain/entities/Wire.js b/src/domain/entities/Wire.js
new file mode 100644
index 0000000..1703c64
--- /dev/null
+++ b/src/domain/entities/Wire.js
@@ -0,0 +1,8 @@
+import { Element } from './Element.js';
+
+export class Wire extends Element {
+    constructor(id, terminals, label = null, properties = new Properties()) {
+        super(id, terminals, label, properties);
+        this.type = 'wire';
+    }
+}
diff --git a/tests/domain/Element.test.js b/tests/domain/Element.test.js
index 84ce8f2..1a01d45 100644
--- a/tests/domain/Element.test.js
+++ b/tests/domain/Element.test.js
@@ -1,5 +1,7 @@
 import { expect } from 'chai';
 import { Element } from '../../src/domain/entities/Element.js';
+import { Resistor } from '../../src/domain/entities/Resistor.js';
+import { Wire } from '../../src/domain/entities/Wire.js';
 import { MockElement } from './MockElement.js'; // A mock element class for testing
 import { Position } from '../../src/domain/valueObjects/Position.js';
 import { Label } from '../../src/domain/valueObjects/Label.js';
@@ -80,4 +82,10 @@ describe('Element Class Tests', () => {
     
     // Tests for MockElement
     testElementSubclass('MockElement', MockElement, { mockProperty: 42 });
+
+    // Tests for Resistor
+    testElementSubclass('Resistor', Resistor, { resistance: 100 });
+
+    // Tests for Wire
+    testElementSubclass('Wire', Wire, {});
 });
\ No newline at end of file