SCP1132 - Introduction to Physics Lab 4 & Advice, Hints With Circuit Analysis Problem - Physics Assignment Help

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Just some advice on Lab 4. This is an accumulation of a few year’s responses to student preparation submissions,  and lab notebook write-ups, so I fully expect some of you to make the same mistakes as previous students. This handout is to save both of us in solving the questions and in sending individual feedback where you have misinterpreted a concept. If you have made a mistake that is mentioned below in the Preparation, in your feedback  I will just say "see Lab 4 Hints".  

First, just some advice about how to answer a problem in an assessment item such as an assignment (lab preparation worksheet) and the final examination. This information is actually in the Unit Plan, but it obviously needs reinforcement based on submissions. This preparation worksheet is a little more difficult than previous sheets, because it requires more explanation of the concepts involved on your part (for example, in Q1 parts (a)  and (b)).  

Physics is about Observation and Explanation. When providing the solution to a problem, the explanation part is very important and is where you will gain most of the marks for the problem. You must provide an explanation of the concept involved (this should be brief but concise - no essays) and then you must develop the solution. This is not an equation plugfest! Too many students are just writing an equation with numbers, and there is no explanation of what this means (and in many cases is incorrect).

If you do not follow this advice in the final exam,  then your mark in the long answer section (Section B) will not be very good. Those students who follow this advice will do very well in the final exam, because most of the marks are for your explanation and development of your solution, not just picking a formula and trying to plug in numbers. Study the solutions I have issued for the tutorial questions – although I tend to go a little overboard (because I am trying to explain to you the concept involved and how to apply it), you should be trying to emulate this process to some extent. I am not expecting you to construct a novel; you just need to provide an adequate explanation. The key is to think about what explanation you would include if you were trying to explain this to someone who has no knowledge of the concepts.  

This is not an exercise in the marker trying to guess the meaning of what you have written; you have to provide enough explanation so that they can be confident that you understand the concept and how to apply it.  Examiners assume that they know nothing of the subject, and often mark from a marking guide. If you leave out a major step they cannot give you the marks for that step.  

Where appropriate, you must draw relevant diagrams. In this case, these will be schematic circuit diagrams. If you take a copyrighted image from another publication, you MUST provide a reference to the relevant source. Otherwise,  this is and violation of copyright.  

Question 1: This is a circuit analysis problem. It relates to Experiment A. This experiment is mostly qualitative. You observe the behavior of the circuits and discuss the results relative to the Physics involved. Treat the globes as identical resistors (of resistance R). Parts (a) and (b) are separate, so don’t mix up the circuits. However, you can compare their behaviour.  

Q1(a): In a series circuit, the same current passes through each component in the circuit. When considering what the light output will be, consider the power delivered to each (identical globe). The light output relates to the power delivered to the globe.  

Q1(b): In a parallel circuit, the same potential difference is across each globe (identical resistor). Consider what happens to the circuit properties (total current flowing through the circuit and potential differences). Again, it is the power delivered to each globe that is important. As well as stating what happens in this circuit as you add parallel resistors, you can also compare the light output for the series and parallel circuits. Note that the total current in this circuit increases as you add globes in parallel (why?) but this doesn’t mean that the current through each globe increases. Consider why. 

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