# Understanding voltage and current relationship

### What's the Difference Between Amps, Volts and Watts? Voltage and Current. Voltage is an electric force that causes free electrons to move from one atom to another. Just like water needs pressure to force it through a. May 6, Did you know that electrical current is affected by the voltage and resistance in a circuit? In this lesson, we'll use Ohm's law, which tells us. Electronics Tutorial about the Relationship between Voltage Current and terminal of the supply and for ease of circuit understanding conventional current flow.

Here are the standard units of measurement for electrical current, voltage, and resistance: Standardized letters like these are common in the disciplines of physics and engineering, and are internationally recognized. Each unit of measurement is named after a famous experimenter in electricity: The amp after the Frenchman Andre M. The mathematical symbol for each quantity is meaningful as well. Most direct-current DC measurements, however, being stable over time, will be symbolized with capital letters. Coulomb and Electric Charge One foundational unit of electrical measurement, often taught in the beginnings of electronics courses but used infrequently afterwards, is the unit of the coulomb, which is a measure of electric charge proportional to the number of electrons in an imbalanced state.

One coulomb of charge is equal to 6,,, electrons. Cast in these terms, current is the rate of electric charge motion through a conductor.

## Relationship and Difference Between Voltage, Current and Resistance

As stated before, voltage is the measure of potential energy per unit charge available to motivate electrons from one point to another. Defined in these scientific terms, 1 volt is equal to 1 joule of electric potential energy per divided by 1 coulomb of charge.

• QUICK TIP — What’s the difference between Amps, Volts and Watts?
• Ohm’s Law - How Voltage, Current, and Resistance Relate
• What are amps, watts, volts and ohms?

Thus, a 9 volt battery releases 9 joules of energy for every coulomb of electrons moved through a circuit. These units and symbols for electrical quantities will become very important to know as we begin to explore the relationships between them in circuits. Ohm expressed his discovery in the form of a simple equation, describing how voltage, current, and resistance interrelate: In this algebraic expression, voltage E is equal to current I multiplied by resistance R.

Using algebra techniques, we can manipulate this equation into two variations, solving for I and for R, respectively: These all are operated using the basic power source that is, the movement of electrons. Current is the flow of electrons Resistance is defined as, it is the tendency of a material to restrict the flow of current. So, when we discuss about these values, the behavior of electrons in a closed loop circuit allows charge to move from one place to another. He described a unit of resistance which is defined by voltage and current. The difference between voltage and current and resistance is discussed below.

### Relationship and Difference Between Voltage, Current and Resistance

In this equation, voltage is equal to the current and that is multiplied by resistance. Basic Circuit Diagram of V, I and R In the above circuit, when the voltage and resistance values are given, then we can calculate the amount of current. The differences between V, I and R are discussed below. The voltage is defined as, it is the potential difference in charge between the two points on a circuit, it is also called electromotive force.

One point has more charge than another. The unit volt is termed after invented by Italian physicist Alessandro Volta. The term volt is represented by the letter V in schematics. The measuring instrument of voltage is the voltmeter. Voltage is the source and the current is its result, it can occur without current. The voltage gets distributed over different electronic components which are connected in series in the circuit, and in parallel circuit voltage is same across all components which are connected in parallel. The current is defined as it is the rate of flow of electric charge in a circuit. The measuring instrument of the current is an ammeter. The flow of current is same in all the components which are connected in series. And, current gets distributed when components are connected in parallel.

Voltage, Current and Power explained

The Resistance is defined as, it is the opposition that a substance offers to the flow of electric current. It is denoted by the letter R. The unit of resistance is the ohm, and the measuring instrument of the resistance is a multimeter.