Recent content by Celt67

I solved for v and r back here. I still don't know if that's right because I didn't expect v = 0 = r because it is described as a non-ideal power supply in the question. Is it right or wrong? Edit: I just worked it out using Thevenin's Theorem and v = 0 and r = 0. "The change in temp per...

The change in temp per second of an NTC will be constant when the power generated in the NTC (temp) is greater than the rate at which the NTC loses heat to its environment and when the NTC is at approx. room temp? Edit: If you are given a graph of Power (j-axis) versus Temp (i-axis), and it...

I noticed one other slip up when I posted the question, very sorry. Data points: (0.16, 6.9) (0.25, 6.84) (0.33, 6.79) Therefore my equations above should be right. I was thrown because v = 0 = r because it is described as a non-ideal power supply in the question.

I had the resistances worked out. (The figures I had supported that the NTC's resistance dropped as it heated up. I know that's the basis on which thermistors work.) That's how I set up the simultaneous equations in my post above! As above, I put the figures into the equation V + v = I(R +...

It was meant to be (I, V). Just made a mistake when typing it out at first.

Ok, I probably should have posted my workings: E = V + v = I(R + r) 6.79 + v = 0.33(20.576 + r) 6.79 + v = 6.79 + 0.33r A: v - 0.33r = 0 6.9 + v = 0.16(43.125 + r) 6.9 + v = 6.9 + 0.16r B: v - 0.16r = 0 Or those equations can be achieved from v = Ir Therefore, v = 0 and r =...

I'm way too tired to get into a discussion like this or make any useful contribution! This is something physics professors like to chat about, or so I've heard!

Very interesting question. Pressure as a scalar quantity is debatable. I think that it is a scalar quantity because it is per unit area. There is no direction involved as such. I'm not sure about stress. I think pressure deals with liquids and stress is for solids. I could be wrong.

Yeah, you can using V = IR. That's part of what I did.

Homework Statement Ok, you'll have to bare with me on this problem, this topic is not covered as part of my second level education. I think that ye do this in the US though. You are given a circuit containing a non-ideal power supply, an NTC resistor, an ammeter, a voltmeter, and a switch...