A parallel circuit is one in which current can flow through several paths simultaneously.
Notice that unlike a series circuit in this circuit current flows through resistors 1, 2, 3 and 4 simultaneously. If you stopped the flow of current at any of those resistors, current would still flow through the others. See circuit this concept.
Parallel Circuit Rules and Formulas
Total Voltage is the same or the voltage on any resistor. The voltage on all resistors is the same.
Total Voltage = Voltage at resistor 1 = ...Voltage at Resistor n
Vt = V1 + V2 + ... Vn
Total Current is the sum of the individual currents on the different resistors.
Total Current = Current at resistor 1 + Current at resistor 2 + ... Current at Resistor n