Currents Definition and 476 Threads

Consider the following problem: There is a uniform magnetic field pointing into the page. A set of rails is placed horizontally inside the field. A metal rod can slide freely on the rails, when we apply a force to move the rod to the right, is there any induced current in the rod when moving...

Hey, I have a question to ask and was wondering if you guys could help me. 5.) A computer has a 300-W power supply. If household voltage is 120 V, how much current will flow through the computer? A. 0.4 A B. 2.5 A C. 180 A D. 420 A E. 36,000 A I picked B. I used the equation...

Four very long, current-carrying wires in the same plane intersect to form a square with side lengths of 42.0 cm , as shown in the figure. The currents running through the wires are 8.0 A, 20.0 A, 10.0 A, and I. ******^ ****** | ------10 A------I -------|--------|-------- 8 A --->...

1] Two long straight parallel conductors each carrying a current of 24 amps flowing in the same direction are fixed at a distance of 40mm from each other. A third parallel conductor is placed equidistant from the other two and carries a current of 30 amps. Show that the force on the third...

I have to find the Requivalent and all of the currents and voltages in the circuit below. l------------Resistor 1----l---------l l l l battery l l l Resistor 2 Resistor 3...

What is the maximum instantaneous power dissipated by, and maximum current passing through, a 3.0-hp pump connected to a 240-V ac power source? ANSWER: 6 hp, 13 A Given: P = 3 hp = 2238 W (1 hp = 246 W) V = 240 V I don't know which formula to use. At first, I attempted to use P...

So this problem asks you to determine the magnitudes and irections of the currents in the resistors. I definitely understand how to determine directions, using Kirchhoff's Rules. But here is where I get stuck: the batteries have emfs of E1 = 9.0 V and E2 = 12.0 V and the resistors have vlaues...

Two long parallel wires are a distance of d = 4.5 cm apart and carry equal antiparallel currents of 1 Amperes. Find the magnetic field intensity (in T) at the point P which is equidistant from the wires. (R = 2 cm). Now I really thought I had this. I thought the magnetic field at P would...

Anybody Know The Currents And Equations For This Problem? Please if you can, help me! I am usually very good at circuit problems but this one has me baffled! here's the link: http://www.coloradoacademy.org/~phogan/apphys/quiz/rq2_8b.htm Thanks A Lot!

I'm kinda stuck on this question: 1. Calculate the magnitude ofthe magnetic f ield at a point midway between two long, parallel wires that are 1 .0 m apar t and have currents of1 0.0 A and 20.0 A, respectively, ifthe currents are (a) in opposite directions and (b) in the same direction...

http://www.nature.com/news/2004/041025/full/041025-9.html Great! Wait until the extreme sports folks get ahold of this one. :biggrin:

I am working on a project involving electrically heating clayey soils (having 55% moisture content and 0.5 M salt (nacl/KCl) solutions in the pore space. Does anybody know if electrolysis of water/electrolyte is a concern with AC currents (230 V, 60 Hz frequencies)? Thanks, WWW :smile:

Do convection currents occur in all bodys of water and gas? Or are they only at a certain temperature, under certain circumstances?

If we imagine a fluid traveling through a pipe as being a warm current of sea-water moving over a cold denser layer of sea-water, with the air immediately above the warm current forming one wall of the pipe, would the pressure of the warm current decrease as the current travels faster,and if...

I've read that when currents in two parallel wires are going in the same direction, they attract each other. The same text said that when the currents are going in opposite directions, the two wires repel each other. Why does this happen? Is there a different behavior for AC and DC currents?

I have the following problem on which I am unsure how to proceed. A spring with a spring constant K = 20 N/m is shown below. It is stretched 1 cm from its equilibrium position when a current I passes through the wire. How big is the current in the wire? The magnetic field is coming out...

Hey there! This question has be a bit confused as to where to start--- Suppose you made a 4.70 k-Ohm resistor from a carbon resistor and a Nichrome wire wound resistor connected together so the total resistance is the sum of their separate resistances. What value should each of these...

Hey - do you think anyone could help explaining the process of conduction and radiation, convection currents for me? Physics exam next Monday, and I have to start studying soon! Also, what is density measured in? Kg/M^2? Thanks in advance!

A high voltage transmission line with a resistance of 0.06 ohms/km carries a current of 1337A. The line is at a potential of 500kV at the power station and carries the current to a city lovated 191km from the power station. What is teh power loss due to resistance in the line? Answer in units...

Our physics teacher gaves us online homework, and he was gone on friday and it is due by midnight tonight. Here is an example problem that we are having trouble with: A copper cable is designed to carry a current of 400A with a power loss of 4 W/m. What is the required radius of this cable?

The emitter current in a certian npn transitor is 8 mA. If .8% of the minority carrier injected into the base recombing with the holes, find the base current , collector current and the exact value of alpha i am not sure how to get this started thanks joe

At my school we are currently investigating Currents & Electricity and me and my teacher would like to know why Current was giving the symbol 'I' instead of say 'C' more so when Volts is given 'V' and Amps is giving 'A'. Both of us would really like someone to shed some light onto this matter.

I have a CRT monitor aligned against the wall of my apartment. At times the screen begins to shake as though a current was running near it. I looked outside and there are 3 big 1-1.5 inch thick wires going up the wall near where my CRT monitor is. I assume this is the problem. Because of my...

i have been following the posts about the electric sun my interest is the birkeland currents, this link gives some insight http://www-istp.gsfc.nasa.gov/Education/wcurrent.html my problem is understanding how these currents flow through space "how is the initial contact made"? why is it...

I am trying to add an LED to one of my computer parts, but there is not enough current flowing through. I would like to know how to increase the voltage to the LED without messing with any computer parts. I remember something about wires, but i do not remember exactly what to do to increase...

Guys & Gals Everyone has seen the jumping rings demonstration…. Aluminium works fine, so does silver, iron and steel just stick to the coil Cut slots or drill holes in the disks and you get what you would expect BUT… Why doesn’t gold work? Cheers Mike