Wednesday, May 19, 2010

Reflection: Electricity

DC Circuits:

Direct Current is when electrons flow continously from a positive to a negitive area through a conductor. A DC circut is made up of a generator(a powersource), a conductor(like a wire), and a resisotor( the place the energy is used). All DC circuits have a constant voltage and current. There are three types of DC circuits series, parallel, and complex these are explained below. 

In a series circuit because there is only one path to follow the current is the same throughout the entire circuit. However the voltage drops while going through the resistor. The voltage drops are added up the will equal the total voltage.

Parallel circuits have multiple resistors, this means there are many paths for the current to flow down. The total current is the sum of each resistor's current. Resistors in parallel circuits have equal voltages, all voltages are equal. The amount of each voltage in each resistor equals the total voltage. 

Resistance in a complex circuit has to be found in multiple steps. First you would have the parallel resistance. Then add the the parallel resistance to each of the resistances of the other resistors. After this divide the total voltage by the total resistance to find the total current. To find individual voltage of each resistor multiple the total current by resistance in each resistor. 

1 comment:

  1. Nice job with your diagrams!
    Please correct your spelling in the first paragraph: "negitive" and "resisotor"
    There are some incorrect statements in your posting. First of all the battery is not a source of power, it is a source of energy. Also, you claim that the voltage "drops" while going through the circuit. That is not the case. Voltage does not go through the circuit, voltage is the potential difference across an element in a circuit.
    Your explanations are simply re-statements of the equations.
    Please be sure that you understand how the circuits work as it is an important part of the final exam.