diff --git a/src/solarcarsim/physsim.py b/src/solarcarsim/physsim.py
index ee6f806..1d887c7 100644
--- a/src/solarcarsim/physsim.py
+++ b/src/solarcarsim/physsim.py
@@ -1,5 +1,16 @@
-# Physical simulations of the car
-# This includes Car parameters, slope, velocity, aerodynamic resistance,
-# rolling resistance, motor efficiency, solar inputs, etc.
+import jax.numpy as jnp
 
+def calculate_energy_consumption(car_params, elevation_profile):
+    """
+    Calculate energy consumption based on car parameters and elevation profile.
+    
+    Args:
+        car_params (dict): Dictionary containing car parameters.
+        elevation_profile (list): List of elevation points.
+        
+    Returns:
+        float: Total energy consumed.
+    """
+    # Placeholder for actual calculations
+    return 0.0