BLOG 2 - ELECTRIC CIRCUITS 1

This blog contain about ohm’s law

What do you usually think when you are asked, what is ohm’s law? If you think of a difficult, boring, and useless topic then, you should think again. You know why? All of us should have knowledge of electrical quantities and unit, even the most common ones only, is important analyzing electrical circuits.

Understanding ohm’s law, although the three quantities, current, voltage, and resistance, are use differently, they related to its other this relationship is know us ohm’s law. Ohm's law state that the voltage V across a resistor is directly proportional to the current I flowing through the resistor.

The fundamental relationship between voltage, current and resistance - in an electrical circuit is called Ohm’s Law. All materials are made up from atoms, and all atoms consist of protons, neutrons and electrons. Protons have a positive electrical charge. Neutrons have no electrical charge while Electrons, have a negative electrical charge. Atoms are bound together by powerful forces of attraction existing between the atoms nucleus and the electrons in its outer shell.

Surface-mount technology - is a method for producing electronic circuits in which the components are mounted or placed directly onto the surface of printed circuit boards. An electronic device so made is called a surface-mount device.

Open circuit - an open circuit exists when there is a break or gap in the circuit.

Causes of open circuits;

• ·        broken wire
• ·         poor connection
• ·         loose terminal
• ·         blown fuse
• ·         tripped circuit breaker
• ·         faulty switch
• ·         Blown globe

Short circuit - a short circuit exists when the original path of current flow is altered and a shorter than normal path for current flow exists.

Causes of short circuits;

• ·         worn or damaged wiring insulation
• ·         wire squashed or jammed between components
• ·         tools dropped across or accidental contact between positive and negative
• ·         incorrectly connected ammeter
• ·         Active wire incorrectly connected or joined to neutral position

AN OVERVIEW FOR THIS WEEK

To start let's have a recap of what we did and learned for this week.

Every Monday, Wednesday and Friday is the class discussion and Tuesday is the laboratory.

Last Monday, June 23 2014 we had our class discussion. we tackled about Ohm's law and as what i had learned Ohm's law is a current directly proportional to the voltage and inversely proportional to the resistance.

In every daily living we are applying Ohm's law, though we did not recognized it but the fact is we applied circuits in our home the appliances that we are using as well as enjoying that makes our lives become more comfortable it has a current as well as voltage and it is important to know how it works.

On the following day our laboratory. It was Tuesday and our professor let us familiarized the different components ad equipment such as IC, digital multimeter, resistor, transistor and hindi ko na alam ang iba :) hahaha. After that we find the manufacturer, model number, type of power supply and sketch. 

Wednesday June 25, 2014 the class discussion again it was the continuation of last topic.

BLOG 1 - ELECTRIC CIRCUITS 1

What are electrical circuits?

Electrical circuits are an electrical network that has a closed loop giving a return path for the current. 

TOPIC

CHARGE q(t) - is the quantity in a electric circuits.
                          - defined as an electrical property materials.
                          - measured in coulomb (c).
                          - Formula of charge  q=ʃidt.

CURRENT i(t) - defined as the charge flow rate.
                           - measured in ampere (A).
                           - Formula of current  i=dq/dt.  

VOLTAGE v(t) - defined to be the charge rate of doing work.
                           - measured in volt (V).
                           - Formula of voltage V=I/P.
POWER - defined to be the time rate of doing work.
                - can absorb or supplied by circuits elements.
               * Positive - element absorb power.
               * Negative- element supplies power.

ENERGY - defined as the capacity to do work.
                  - measured in joules (j).

THREE BASIC CIRCUIT ELEMENTS 

• POWER SOURCE - defined to be the charge rate of doing work.

• LOAD - the circuit connected to the terminal and a power consumed by a circuit.

• CONDUCTOR - is an object or a type of material that permits the flow of electrical current in one or more directions.

TYPE OF ELEMENT

• ACTIVE ELEMENT - capable of generating energy.

• PASSIVE ELEMENT - absorbs energy.

• VOLTAGE AND CURRENT SOURCE - the most important active element.

MY LEARNING

The things i learned from the previous discussion was that electric circuit is a path in which electrons from voltage or current source from flow Electric current flows in a closed path called an electric circuit. The point where those electrons enter an electrical circuit is called the "source" of electrons. As result we are now enjoying as well as make use in our daily lives that make our works easier and become more convenient. It is important to know the current in order to make use the right voltage in our appliances because if we don’t know the right current on a certain voltage it may cause damages to the appliances.