In a series circuit, voltage is divided between the devices connected in the circuit proportionately to the resistors. However, each device in a series circuit receives the same amperage. Resistors connected in series in a simple circuit. By contrast, current may follow more than one path in a parallel circuit. In this circuit, current can flow through any single device or all devices simultaneously.
Devices connected in parallel receive the same voltage.
However, the total current flowing through a parallel circuit splits proportionately at each resistor and is equal to the sum of the current flowing through each device. Resistors connected in parallel in a simple circuit. To test for continuity. To understand a simple electrical circuit. To correctly use electrical measurement instruments.