tion:Current flow in circuits is produced when charge carriers travel though conductors. Current is defined as the rate at which this charge is carried through the circuit. A fundamental concept in physics is that charge will always be conserved. In the context of circuits this means that, since current is the rate of flow of charge, the current flowing into a point must be the same as current flowing out of that point.Figure 1Three WIRES connected at a node with I1 and I2 TRAVELLING towards the node and I3 travelling away from the nodeThree wires connected at a node with different currents travelling down each wire.Kirchhoff's current LAW states that for the diagram above, the currents in the three wires must be related by:1+2=3I1+I2=I3It is important to note what is meant by the signs of the current in the diagram - a positive current means that the currents are flowing in the directions indicated on the diagram.The standard WAY of displaying Kirchhoff's current law is by having all currents either flowing towards or away from the node, as shown below:Figure 2Three wires connected at a node with different current travelling down each wire TOWARD the node with each current labelled I1, I2 and I3. Here, at least one of the currents will have to be negative (i.e, away from the node and in the opposite direction to the arrows on this diagram)and Kirchhoff's current law can be written as:1+2+3=0I1+I2+I3=0This can be generalised to the case with n wires all connected at a node by writing:∑=1=0