Recent content by pconstantino

sorry i still don't "get it". ive studied electric and magnetic fields, i understand what potential energy is and i accept it for a particle in an electric field but i can't understand it when it;s in a wire. what makes the electrons inside a resistor to lose E P.E. ? even if they bump...

Why do they say an electron gains energy inside a battery ? the charge of an electron doesn't change after passing through a battery, why does the potential energy increase? what does it mean to lose energy after passing thru a resistor? what energy is there to lose? kinetic...

i don't get it either... someone please help me?

i don't understand your formula mate, could you explain it please?

why does the problem tell me the distance of 24m then if I don't use it? that's the dilemma

Hello All, I have been trying to solve the following exercise but I can't get my head around it: Two loudspeakers are 24m apart and they produce sound at a frequency of 1000Hz, assume speed of sound is 330m/s, what is the distance between each node? I don't undertand it, should I imagine...

that completely makes sense, but wow, each person tells me one thing... what about the electric field which pulls the electrons? :S

Thank you very much for your reply. What so you mean by concentrations or gradient? Do you mean that on the negative side there are so many electrons that they repulse each other and end up going through the longest path? If you extend the wire around the Earth the current would still...

Nice, I get that. But think about this, why do the electrons travel all the way through the wire to reach the other end, why don't they kind of accumulate at the negative end of the battery, since the positive pole, which has a lack of electrons would attract those electrons ?

wow, amazing, this helps a lot, thank you so much my friend.

Hello, we been set a physics assignment where we are given a table of data, a spaceship approaches a planet, and the velocity and radius are given at certain points, we have to graph velocity against 1/r and hence find the mass of the planet. I really don't get this question, i tried slope...

Your explanation is good, I read it, sorry about that. One of the things I found confusing was, why is the direction of the electric field different from the direction of the force pushing the test charge?

Do you know how this was created?

Wow but my teacher told us that the electrons travel at almost the speed of light in the wire, if current is DC

But you see, in mathematics does the right hand rule agree with cross product ? When you take the cross product of two vectors, if you use the right hand rule, will you end up pointing to the same new vector?