# Relationship of current and voltage

A device's IV curve – current versus voltage curve – is a graph of the current that will flow in the device as a function of the voltage across it. As suggested by. Give your classroom, office, or workspace a quick way to reference the relationship between voltage, current, resistance, and power. Email*. Would you also like. The first, and perhaps most important, relationship between current, voltage, and resistance is called Ohm's Law, discovered by Georg Simon Ohm and.

In other words, if we increase the voltage, then the current will increase. But, if we increase the resistance, then the current will decrease. We saw these concepts in action with the garden hose. Increasing the pressure caused the flow to increase, but getting a kink in the hose increased the resistance, which caused the flow to decrease.

Using this diagram is an easy way to solve equations.

The way the equation is written here, it would be easy to use Ohm's law to figure out the current if we know the voltage and the resistance. But, what if we wanted to solve for the voltage or the resistance instead? One way to do this would be to rearrange the terms of the equation to solve for the other parameters, but there's an easier way. The diagram above will give us the appropriate equation to solve for any unknown parameter without using any algebra.

To use this diagram, we simply cover up the parameter we're trying to find to get the proper equation. This will make more sense once we start using it, so let's do some examples.

Ohm's Law in Action Below is a simple electric circuit that we'll use to do our examples. Our voltage source is a battery that is connected to a light bulb, which provides resistance to the electric current.

To start off with, let's say our battery has a voltage of 10 volts, the light bulb has a resistance of 20 ohms, and we need to figure out the current flowing through the circuit. Using our diagram, we cover up the parameter that we're trying to find, which is current, or i, and that leaves us with the voltage, v, over the resistance, r.

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

In other words, to find the current, we need to divide the voltage by the resistance. Doing the math, 10 volts divided by 20 ohms results in one half ampere of current flowing in the circuit.

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To find the current, divide the voltage 20 volts by the resistance 20 ohms. Next, let's increase the voltage to see what happens to the current. The amp after the Frenchman Andre M.

## Ohm's Law: Definition & Relationship Between Voltage, Current & Resistance

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.

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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. These units and symbols for electrical quantities will become very important to know as we begin to explore the relationships between them in circuits.

### electricity - How does increasing voltage or current affect the power? - Physics Stack Exchange

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: What is the amount of current I in this circuit?