Valves of the Heart. The heart functions by pumping blood both to the lungs and to the systems of the body. To prevent blood from flowing backwards or âregurgitatingâ back into the heart, a system of one-way valves are present in the heart.
An electric circuit is a path in which electrons from a voltage or current source flow. Electric current flows in a closed path called an electric circuit. The point where those electrons enter an electrical circuit is called the source of electrons.
As a result, they lose energy to the atoms. This energy appears as heat, and the scattering is a resistance to the current. Think of the bridge as a garden hose. The current of electricity is the water flowing in the hose and the water pressure is the voltage of a circuit. The diameter of the hose is the determining factor for the resistance. Current refers to the movement of charges. In an electrical circuit â electrons move from the negative pole to the positive. If you connected the positive pole of an electrical source to the negative pole, you create a circuit.