The total amount of charge in a circuit does not change.The rules governing circuits are the conservation of energy and the conservation of charge.Current is the rate of flow of charge around a circuit.The role of the charge carriers is to transfer energy from the source of the e.m.f. to the component which converts the electrical energy into a different form of energy.When an e.m.f. is applied the charge carriers slowly drift towards the positive terminal at a rate of a few millimetres per second.
ΣI = 0The algebraic sum of the currents entering a junction is equal to zero. The sum of all the currents entering at any point (such as a junction) in a circuit is equal to the sum of all the currents leaving that point. This is a consequence of the conservation of charge.
ΣI = 0The algebraic sum of the currents entering a junction is equal to zero. The sum of all the currents entering at any point (such as a junction) in a circuit is equal to the sum of all the currents leaving that point. This is a consequence of the conservation of charge.