Voltage Explained

What is voltage and what does it do.

Voltage explained. It says that the current is equal to the voltage divided by the resistance or i v r. Voltage is the pressure from an electrical circuit s power source that pushes charged electrons current through a conducting loop enabling them to do work such as illuminating a light. Voltage drop vd occurs when the voltage at the end of a run of cable is lower than at the beginning. Finally remember that if you know the voltage of your power supply then you can calculate the current through a bulb fuse or other electrical appliance or component based on its rating in watts.

The three basic principles for this tutorial can be explained using electrons or more specifically the charge they create. The greater the voltage the greater the flow of electrical current that is the quantity of charge carriers that pass a fixed point per unit of time through a conducting or semiconducting medium for a given resistance to the flow. This is known as ohm s law. The voltage is equivalent to the water pressure the current is equivalent to the flow rate and the resistance is like the pipe size.

Voltage is the difference in charge between two points. The connection between voltage and static electricity is poorly explained in the books and that s one main reason why voltage seems so complicated and mysterious. Any length or size of wires will have some resistance. Current is the rate at which charge is flowing.

Voltage drop is the loss of voltage caused by the flow of current through a resistance. A safe voltage is considered to be less than 50v rms ac or 120v dc ripple free. There is a basic equation in electrical engineering that states how the three terms relate. Voltage also called electromotive force is a quantitative expression of the potential difference in charge between two points in an electrical field.

These voltages are known as extra low voltages relate to touch voltage limits. Voltage is what makes electric charges move. In the international system of units the derived unit for voltage potential difference is named volt. The term recognizes italian physicist alessandro volta 1745 1827 inventor of the voltaic pile the forerunner of today s household battery.

Voltage electric potential difference electric pressure or electric tension is the difference in electric potential between two points which in a static electric field is defined as the work needed per unit of charge to move a test charge between the two points. In this video we discuss how it work and its purpose to understand how electricity works.