4.- Series and parallel circuits.
Connecting elements in series
A series circuit is one that only provides one path for the flow of current. The elements are connected one after the other.
Any type of circuit component can be connected in series: energy sources, control elements and output devices. In order to be considered a series connection, they must have one single path for the current to pass through.
The total resistance of a series circuit is obtained by adding the all the resistance values in the circuit.
When several generators or batteries are assembled in series, we must take the polarity into account. If the positive pole of a battery is connected to the negative pole of the following battery, the voltages will add up, while when two poles of the same polarity are connected, the voltages will be subtracted. Connecting generators in series with opposite poles allows greater voltages to be obtained without changing the current values in the circuits.
In a series circuit, the following applies:
Os dejo un vídeo explicativo de los circuitos serie:
Problem: Calculate the current and the voltage in each resistor.
Connecting elements in parallel
A parallel circuit is one that has several possible paths available for the flow of current.
Two or more resistors are connected in parallel when both ends are joined together, thus forming as many paths as there are resistors in the assembly.
- In cases where two or more resistors are connected in parallel, as with the series resistors, it is possible to calculate the equivalent resistance of the assembly. The total resistance of a parallel circuit is obtained by means of the following formula:
- In cases where two or more generators are connected in parallel, you must make sure that they all have the same voltage and, as they are components with polarity, all the positive poles are joined on one side and all the negative ones on the other. When connecting two or more generators of the same voltage in parallel, the voltage is maintained and the charge and intensity supplied are increased.
Os dejo un vídeo explicativo de los circuitos paralelo:
Problem:
Calculate the intensity and the voltage in each resistor.
Actividad evaluable.
Tendréis que hacer los dos ejercicios que se proponen en los dos apartados y subir una foto a Google Classroom (próximamente disponible) antes del final del día 1 de mayo.
Además, antes del final del 1 e mayo también tenéis que rellenar el siguiente formulario:
