you need
  • ohmmeter, measuring bridge, calculator.
Guide
1
To start, determine how the elements of an electrical circuit connected to each other, as it affects the calculation of the total resistance.The conductors may be in serial or parallel connection.Serial communication - it is a connection when all the elements are connected so that their site including chain does not have a single node, and parallel connection - it is a connection when all the elements of the circuit combined two nodes and have no links to other sites.
2
If you determine that the conductors in the circuit are
connected in series, find the impedance is not difficult.Just fold the resistance of all elements.If you are not given the resistance of each conductor, but given their voltage and current of any circuit element, then adding all the stress, you know the total voltage.Current of each element in the series connection are equal, then there is a total current in the whole circuit is equal to a current conductor of any given chain.Then, to find the impedance, divide the total voltage on the power supply.
3
If the elements are connected in parallel, the total resistance can be found in the following way: multiply the resistance of all conductors and divide their sum.If you are not given the resistance of each element, but given their current and voltage of any circuit element, then adding all of the current, you will learn common.The voltage of each cell are connected in parallel, that is, and the total voltage across the circuit is equal to the voltage of any conductor of the chain.Then, to find the impedance voltage divide the total current.
4
To determine the total resistance of the circuit, use such instrumentation as an ohmmeter and measuring bridge.They will help you identify the electrical resistances.