Recent content by ilyas415

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    Platinum Resistor: Measuring Temperature with High Accuracy

    Homework Statement A Pt-resistance thermometer is used to measure temperatures in the range 0°C to 100°C. The electrical resistance of the thermometer is 2 Ω at 20°C and 6 Ω at 100°C. It is necessary to measure the temperature to an accuracy of ± 0.1 K. How accurately must the electrical...
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    Replacing Steel Components with Aluminium Alloys: A Simple Density Question

    Homework Statement The problem is: "Aluminium alloys have a density of 2385 kg m^-3 and steel has a density of 7015 kg m^-3. If aluminium alloys are used to directly replace steel components there should be a three-fold savings in weight. Why cannot this be done?" Homework Equations...
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    Linear expansion of steel question

    ah, I've got it, assume it is a cube with edge length 1m, then I've got to substitute 1m into the equation to find the new length, then i use density = mass/volume, then i get the change in density
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    Linear expansion of steel question

    Homework Statement The question i need help on is question 6 part (c). I think I need to use the equation: 2. Equations used: \DeltaL = \alphaL\DeltaT Linear expansion of steel: 12x10 K^-1 (\alpha) Density of steel: 7800 3. My attempted solution: I tried substituting in the...
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    How Do You Solve for x in an Electrical Circuit with Iin/I=10?

    1. Hi. The question I am trying to work out is Question 6 part (v). I'm stuck for a solution to the question. I know that it involves the use of the forumula for resistance and possibly is a potential dividers questions. I don't know quite where to start and I don't understand the following...