Recent content by perjogab

Brass is a conductor isn't it?

Hey guys, I have a physics exam tomorrow. I found a question that I can't solve. Rubbing a polythene rod with a cloth makes the polythene negatively charged but rubbing a brass rod in this way will not charge it. Why can't the brass rod be charged this way? Thanks

Just for clarification, in a frictionless environment why is it not possible to obtain infinite acceleration as there is no opposing forces? I know you can't get infinite acceleration because F=ma, so infinite acceleration would give an infinite force, as well as an infinite velocity which is...

So like I said in the post above, in a series the voltage in the circuits are different. So to find the voltage in the 0.25 ohm resistor you would say once again: V=IR But in this case R is 0.25 ohms, I would be the current of the circuit. So V=IR V=2.14*0.25 Voltage in the 0.25 ohm is 0.535.

uhh, resistors in a parallel share the same voltage but have different current, while resistors in a serious have different voltage but the same current. Formula for resistors in a parallel is Rtotal= 1/R1+1/R3+1/R3...+1/Rn For resistors in a parallel you simply add them FOR VOLTAGE IN A...

Total resistance = 5.5 ohms. I=V/R Current=12/5.5 Power = Current * Voltage Power = 2.14*12 Power= 25.68J (approximation)

Power= Current * Voltage

I got what I needed but thanks for the quick reply.

It wouldn't transfer all of the energy to the ball as some of the energy would be wasted; some energy would be transferred to sound/heat...

I am trying to find out about the relationship between current and voltage in: a) filament lamps b)semi-conductor diodes c) a metal conductor at constant temperature d) a solution of copper (II) sulphate using electrodes. I pretty much know the results I am supposed to get, but could...