How to find resistance?

The ability of an element of an electrical circuitTo prevent the passage of an electric current along it is called resistance. They have different materials, among them - copper, nichrome, iron. And the total resistance is the resistance of the electrical circuit as a whole, and it is measured in Ohms. How to find resistance? To do this you will need a measuring bridge, a calculator and an ohmmeter.

Define the ratio of the elements of the chain to each other

To cope with the task, you needFirst of all, determine how the elements of the electrical circuit are connected to each other. This is very important, because the order of the connection affects ultimately the calculation of the total resistance. Conductors can be in parallel or serial connection. The sequential implies a connection in which all elements are connected in such a way that the section of the chain that includes them does not have a single node. Parallel connection also implies a connection in which all elements of the chain are united by two nodes, and they do not have connections with other nodes.

Fold the resistance of the elements

How to find resistance? If you have already made sure that all the conductors are connected in series, then the full resistance will not be difficult to find. To do this, add up the resistance of all elements. In the case where the resistance of each conductor is unknown, but there are their voltages and current strength of some particular element of the circuit, then boldly add up all the voltages. So you can find out what the total voltage is. In this case, each element of the current intensity for a series connection is equal, which means that the total current in the entire circuit is equal to the current strength of any conductor of the chain. Accordingly, to find the impedance, you need to divide the total voltage by the current.

Another way to find resistance

In the event that the elements are connectedin parallel, the total resistance is as follows: the resistance of all conductors must first be multiplied, and then divided by their sum. If the resistance of each element is unknown, but there are data of their current strength and voltage of one of the circuit elements, then you just need to add up all the current. So you will know the indicator of the total current. With parallel connection, the voltages of each element are equal, respectively, the total voltage of the entire circuit will be equal to the voltage of any conductor in a given chain. Then, to find the impedance, divide the total current by the voltage. Determine the overall resistance of the electrical circuit will help you with such measuring devices as a measuring bridge and an ohmmeter.