# Voltage and current relationship resistor It is customary to use the angle by which the voltage leads the current. This leads The phase relation is often depicted graphically in a phasor diagram. with the resistor since the voltage and current associated with the resistor are in phase. It defines the relationship between the three fundamental electrical quantities: current, voltage, and resistance. When a voltage is applied to a circuit containing . When commencing to explore the globe of electronics and electricity, it is very important to begin by understanding the fundamentals of voltage.

Figure 2 shows a graph of v vs.

Voltage, Current, Resistance & Power

Equation 1 thus describes the voltage-current relationship for a linear resistor. Linear circuit elements are wonderful since they allow us to design what are called linear circuits or linear systems 1.

### Voltage-Current Characteristics and Nonlinearities [vlozodkaz.infontinc]

Linear circuits are much easier to deal with mathematically than nonlinear circuits, but there is one problem with them: As with any other component, all resistors are nonlinear, to some extent.

That is, the voltage-current relationship is not exactly a straight line for all values of current for example, all electrical devices will fail if enough current is passed through them. Figure 3 shows a possible nonlinear voltage-current relationship. However, many nonlinear resistors exhibit an approximately linear voltage-current characteristic over some range of voltages and currents; this is also illustrated in Fig.

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

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. Thus, a 9 volt battery releases 9 joules of energy for every coulomb of electrons moved through a circuit.

### Ohm’s Law - How Voltage, Current, and Resistance Relate | Ohm's Law | Electronics Textbook

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: In the above circuit, there is only one source of voltage the battery, on the left and only one source of resistance to current the lamp, on the right.

In this first example, we will calculate the amount of current I in a circuit, given values of voltage E and resistance R: The electrons do not flow freely due to the restriction of flow of electrons, this is called as resistance. Then all basic circuits comprise of three separate quantities, namely voltage, current and resistance.

Electrical Charge Electricity is the movement of electrons, it creates charge which we can connect to do the work, your light, phone, stereo, etc. 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.

• Relationship and Difference Between Voltage, Current and Resistance
• Ohm’s Law - How Voltage, Current, and Resistance Relate

He described a unit of resistance which is defined by voltage and current. The difference between voltage and current and resistance is discussed below. 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.

## Voltage-Current Characteristics and Nonlinearities

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.