Understanding Charge, Voltage, and Circuit Analysis

In summary, the speaker is a student in a grade 11 physics class currently studying Electricity and Magnetism. They feel a bit lost and are struggling with understanding concepts from grade nine, such as charge and voltage. They are looking for resources to review these concepts and have found a helpful website. However, they still have some questions about the nature of charge and voltage and how they are measured.
  • #1
JimmyRay
89
0
Hi my grade 11 physics class is on its final unit (Electricity and Magnetism) and I am a little lost... So far we are doing Charge and Voltage (we learned the formulas)... and we're expected to know that circuit diagram stuff and Ohm's Law? lol a bunch of stuff we were suppose to learn in grade nine...

I was just wondering if you guys could provide me with a website or something which would help review some grade 9 electricity material or even some grade 11 stuff... I kind of don't understand the concepts (charge, voltage, current!), I know it seems easy but I guess I didnt really learn it well in grade 9. I can do the math but I won't understand what it all means, lol.

We are going to use what we learn and apply it to circuit analysis...I just want a better understanding any help would be appreciated.

thanks.
 
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  • #3
Wow... I just spent like 2 hours reading a bunch of stuff on that site. That helps out a LOT on understanding the concepts related to this unit. It also somewhat confused me... The parts about electromagnetics... and CHARGE was harrrddd to understand, I think I sort of got it now...

But I have a few questions...

Is charge just electrons and protons? Because in the website it said charge was a step below the atoms...and it was a substance...

Voltage is the electric field which surrounds all matter. Right? We measure it by seeing voltage between two distances? But not an object's actual voltage?
 
  • #4
JimmyRay said:
But I have a few questions...

Is charge just electrons and protons? Because in the website it said charge was a step below the atoms...and it was a substance...

charge is a property of particles. It only comes in discrete amounts. The smallest amount is called the elementary charge and is the charge of a proton, approximately 1.6E-19 Coulombs. The charge of the electron is minus this amount of charge. But there are many more types of particles that 'carry' (figurely speaking) charge.

JimmyRay said:
Voltage is the electric field which surrounds all matter. Right? We measure it by seeing voltage between two distances? But not an object's actual voltage?

Not really. The electric field is the difference in voltage (the word used by most physicists is potential). All physically measurable phenomena involve only differences in this electric potential, so the potential reallu has no meaning as an absolute quantity. It is only a mathematical trick to make life easier, but at the end of a calculation you are only interested in potential differences (wich are physically measurable).
 

1. What is electricity?

Electricity is a form of energy that is created by the movement of electrons. It can be found in nature, such as in lightning, or harnessed by humans to power various devices.

2. What is magnetism?

Magnetism is a force that is created by the movement of electrically charged particles, such as electrons. It is characterized by the attraction or repulsion between objects with magnetic properties.

3. How are electricity and magnetism related?

Electricity and magnetism are closely related, as they are both forms of energy that involve the movement of charged particles. Electric currents create magnetic fields, and moving magnets can induce electric currents.

4. What are some practical applications of electricity and magnetism?

Electricity and magnetism have countless practical applications in our daily lives. Some examples include powering electronic devices, generating electricity in power plants, and running motors in cars and other machinery.

5. What are the fundamental laws and principles of electricity and magnetism?

The fundamental laws and principles of electricity and magnetism are described by Maxwell's equations, which explain the relationship between electric and magnetic fields. Other important principles include Ohm's law, Faraday's law, and Lenz's law.

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