Recent content by woodfich

Thanks for the responses In response to your question, luckily I have. I plan on going to each campus once I get the two other decisions. However, I am trying to get as much information from as many different sources before I decide (campus visit is a VERY important one, but I also want to...

Hi everyone. My plan has always been to major in engineering (electrical, mechanical or civil-structural, or even robotics, or nuclear, I'll decide which one specifically once I get a better grasp of each specialty IN college). However, while less probable, I have not discarded pure physics...

Thanks for the responses. I still have a question. The explanation implies that the voltage difference across the motor should decreases once it starts rotating. However, when I measure the voltage with the setup I depicted above, I get a higher voltage difference reading when the motor is...

Anyone? Please, I've been thinking about this all day. It still doesn't make sense to me since the induced emf would produce power in the other direction of the one supplied to the motor. Wouldn't the induced power "cancel out" the original power, thereby decreasing the total power?

Thank you for your answer. The last part most probably applies to my experiment. I am NOT using a battery as a current source (the internal resistance of the cell I am using is considerable). Could you or someone please explain why the quoted happens? (I am still confused about the physics of...

So here is the circuit I came up with to represent back emf in a DC motor with rotational inertia. When current is applied to the motor it spins. When it rotates, the motor acts as a generator and creates a voltage (back emf) as shown (sorry for the incorrect notation, I don't know the...

Thanks for the fast and comprehensive response.

I have a question. I set up a voltmeter and and ammeter (properly connected in parallel and in series respectively) so that when I input power into a motor in the form of DC current, both the voltmeter and the ammeter read positive values. Then, I removed the voltage source (i.e. battery)...

Does Bernoulli's Principle affect a non-flowing fluid in a moving container? As in, if I am in an air-sealed airplane at rest, and then the plane accelerates on the ground (but does not fly), does the gas pressure inside the plane change because the fluid (air inside the cabin) has a velocity...