Where is ohms law used

Fuses are the protection components that limit the amount of current flowing through the circuit and to establish a certain amount of voltage. They are connected in the series in the device. Ohms law is used to figure out which resistors are needed. Mobile and Laptop chargers use DC power supply in the operation. Prev Article Next Article. Conventional Domestic Fans We can control the speed of the fans at our homes by moving the regulator to and fro.

Electric Heaters The electric heaters are the common appliances used in winters throughout the world. Electric Kettles and Irons The electric kettle and irons have a lot of resistors in them. Design of Electric Devices The electronic devices such as laptop and mobile phones require a DC power supply with the specific current.

Fuse Design Fuses are the protection components that limit the amount of current flowing through the circuit and to establish a certain amount of voltage.

Related Posts. One Response Rubab. Different materials or the same materials with different shapes will present different levels of resistance to the flow of current. Ohm's Law states that the current flowing in a circuit is directly proportional to the applied potential difference and inversely proportional to the resistance in the circuit. In other words by doubling the voltage across a circuit the current will also double. However if the resistance is doubled the current will fall by half.

In this mathematical relationship the unit of resistance is measured in Ohms. Ohm's Law formula The Ohm's Law formula or equation is very straightforward.

The formula can be manipulated so that if any two quantities are known the third can be calculated. To help remember the formula it is possible to use a triangle with one side horizontal and the peak at the top like a pyramid. This is sometimes known as the Ohm's law triangle. In the top corner of the Ohms law triangle is the letter V, in the left hand corner, the letter I, and in the right hand bottom corner, R. To use the triangle cover up the unknown quantity and then and then calculate it from the other two.

If they are in line they are multiplied, but if one is on top of the other then they should be divided. In other words if current has to be calculated the voltage is divided by the resistance i. If the voltage has to be calculated then it is found by multiplying the current by the resistance i.

If a voltage of 10 volts is placed across a ohm resistor determine the amount of current that will flow. Looking at the Ohms Law triangle the current is the unknown leaving the voltage and resistance as the known values.

Example 2 In a similar way it is possible to use Ohm's Law to find the resistance if the current and voltage are known. Take, for example, a voltage of 10 volts, and a current 0.

Using the Ohm's Law triangle, it can be seen that:. Example 3 Finally, the other combination is that is the resistance and current are known, then it is possible to calculate the voltage expected across the resistance.

Using Ohm's law it can be seen that if the voltage and current were plotted for a fixed resistor or a length of wire, etc, there would be a straight line. It can be seen that doubling the voltage doubles the current that passes through the particular circuit element.

On the graph, there are two lines, one for a higher resistance - this one requires more voltage to be applied for a given current flowing. Accordingly this must have a higher resistance. Conversely the curve for the lower resistance shows a component that requires a lower voltage to be applied for a given current. Components that have a linear or straight line follow Ohms law and they are known as Ohmic conductors.

However, not all electrical electronic components have a straight line plot for voltage and current. These conductors are often said to be non-Ohmic. Ohm's Law discovery There is a mathematical relationship which links current, voltage and resistance.