summary
● An electric circuit consists of a voltage source, a load, and a conductor.
● The current path in an electric circuit can be series, parallel, or series-parallel.
● A series circuit offers only one path for current to flow.
● A parallel circuit offers several paths for the flow of current.
● A series-parallel circuit provides a combination of series and parallel paths for the flow
of current.
● Current flows from the negative side of the voltage source through the load to the positive side of the voltage source.
● Changing either the voltage or the resistance can vary current flow in an electric circuit.
● Ohm’s law gives the relationship of current, voltage, and resistance.
● Ohm’s law states that the current in an electric circuit is directly proportional to the voltage applied and inversely proportional to the resistance in the circuit.
● Ohm’s law applies to all series, parallel, and series- parallel circuits.
● To determine unknown quantities in a circuit:
● Draw a schematic of the circuit and label all quantities.
● Solve for equivalent circuits and redraw the circuit.
● Solve for all unknown quantities.
● Kirchhoff ’s current law: The algebraic sum of all the currents entering and leaving a junction is equal to 0; it may be restated as the total current flowing into a junction is equal to the sum of the current flowing out of that junction.
● Kirchhoff ’s voltage law: The algebraic sum of all the voltages around a closed circuit equals 0; it may be restated as follows: The sum of all the voltage drops in a closed circuit equals the voltage source.
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