Very little would happen in your body without a small bit of electricity? This is especially true of muscles, which need a small electrical stimulation to trigger them to contract. Since your heart is a muscular pump, every heartbeat is immediately preceded by a small electrical stimulation.
The hearts electrical stimulation starts high up in the Left Atrium and spreads across the two top chambers (the Atria) before reaching the mid-point between the top and bottom chambers. Here, there is a short delay as the electrical signal can only travel along one nerve fibre from the atria to the ventricles.
Once through, the electrical stimulation travels fast along nerve fibres within the muscular walls of the ventricles causing them to contract.
After a short recharge time, another electrical stimulation starts following the same pathway.