Ohm's Law

Introduction

  

Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship:

 

Where I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms. More specifically, Ohm's law states that the R in this relation is constant, independent of the current.

The law was named after the German physicist Georg Ohm, who, in a treatise published in 1827, described measurements of applied voltage and current through simple electrical circuits containing various lengths of wire. He presented a slightly more complex equation than the one above to explain his experimental results. The above equation is the modern form of Ohm's law

V, I, and R, the parameters of Ohm's law.

My Learning on the 2^nd week of leacture

Voltage = Force

Current (I) = Motion

Resistance = Friction

therefore, the higher the force:the higher the motion and it is a direct proportion :)

Common techniques in circuit analysis and design :

-> combining resistors in series and parallel 

-> voltage and current divisions

-> wye to delta and delta to wye transformations

ohms law states that the voltage across an element is directly proportional to the current flowing through it:

           v α i

thus, v=iR and r = v/i

-> r is called resistor

-> has the ability to resist the flow of electric current

-> measured in ohms (Ω)

smt = surface mount technology

Overview:

 In our 2^nd week of lecture we tackled about the ohms law, passive and active elements, dependent current and independent current. We also finished our 2^nd laboratory experiment which we familiarized the electrical materials we used. We familiarized about 8 electrical materials including the RESISTOR, INSULATOR, and CAPACITOR I also learned from sir jay whenever the circuit is a passive element or passive element.  

All about Electrical Circuits

How Do Circuits Work?

                 Circuits work because of moving electrons (negatively charged part of atoms). In a cell (battery) the electrons are repelled away from the negative terminal, through the conducting path and the appliance and back to the cell. After going through the path the electrons are attracted to the positive terminal of the power source and ready to go again. 
                The electrons need a complete path or circuit to flow through so the electrons can go from the negative to the positive terminals of the power source. This flow of electrons is known as an electric current.
If there is a break in the circuit, the electrons can't get through to the appliance and there will be no electrical charge.

Parts of Circuits

All circuits have 3 main parts: a power source, a conducting path and a load (something that will use the electricity). In the labs we did in class we usually used a battery as a power source, a piece of copper wire as a conducting path and a light bulb as a load. To make a more complicated circuits, like the one in your home, you must use a switch. A switch allows you to control the flow of current in an electrical circuit. These allow you to control the power in your home. Think of a light switch.

My Learning on the subject

I learned from this subject are the 3 elements of Electric which are the
Power-p(t); Defined to be the charge rate of doing work, measured in volts(V), and its voltage mat be constant/varying.
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.

Also the Charge-q(t); Basic quantity in an electric circuit. Defined as an Electrical property of materials. Current-i(t); Defined as the charge flow rate, Measured in Ampere(A). Current may be constant/varying. Energy; Defined as the capacity to do work. Measured in joules(J).
Circuit Elements; An element is the basic building block of a circuit. Electric circuit is interconnecting of the elements.

And also the Types of Elements; Active elements-Capable of generating energy(i.e batteries, generators). Passive elements-Absorbs energy(i.e resistors,capacitors and inductors). Voltage and current sources-The most important active elements.