chapter1 - Chapter 1 Measurement In this chapter we will...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 1 Measurement In this chapter we will explore the following concepts: 1. Measurement of a physical parameter 2. Units, Systems of units 3. Basic Units in Mechanics 4. Changing units 5. Significant figures (1-1)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
In Physics we carry out experiments in which we measure physical parameters. We then try to deduce the relationship between the measured quantities. We usually express this relationship in the form of a mathematical equation which we call the “ physical law ” that describes the phenomenon under study. A familiar example is Ohm’s law. The experiment in this case consists of measuring the electric voltage difference V applied across a conductor and the resulting electric current I that flows through the conductor If we plot I versus V we get a straight line. This is expressed in the form: The equation is known as: “ Ohm’s Law R is known as the “resistance” of the conductor Constant V R I == (1-2) + - i V
Background image of page 2
Assume that you step on your bathroom scale and that it reads 120 The number alone is meaningless. It must be accompanied by the units 120 lb is a very different reading from 120 kg! Conclusion: For every physical parameter we will need the appropriate units i.e. a standard by which we carry out the measurement by comparison to the standard.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/31/2010 for the course EE 423 taught by Professor Mitin during the Spring '10 term at SUNY Buffalo.

Page1 / 9

chapter1 - Chapter 1 Measurement In this chapter we will...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online