How does the movement of the electrical impulse relate to the contraction of the chambers of the heart?

the electrical impulses get sent through the conduction pathways which cause ventricles to contract and this allows heart to pump blood.

Explanation:

The electrical impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node. The electrical activity spreads through the walls of the atria and causes them to contract. This forces blood into the ventricles.

And it should be understood that, an electrical stimulus is generated by the sinus node (also called the sinoatrial node, or SA node). The electrical stimulus travels down through the conduction pathways and causes the heart's ventricles to contract and pump out blood.