Sensing

AS Unit G491 - Physics in Action

Chapter 2 - Sensing

Title	Description
Ideas about electric charge	Charge as a fundamental property of electrons and protons. Current as a flow of charge. Q = I x t and E = V xQ Problems on these ideas. AS Physics 40S, 50S, 60S
Ohm's Law	Ideas about Ohmic and non ohmic components. AS Physics 150S, 190D, 270D
Resistance and conductance	Relationship between resistance and conductance, resistivity and conductivity. Calculations Combining resistors in series and parallel. AS Physics 125S, 130S, 140S
The potential divider	Idea that two resistors in series share the supply voltage in the ratio of their resistance values. Sharing voltage calculations.
Sensing circuits	A simple light sensing circuit - definition of sensitivity - practical task. Presentation Team task on building and testing a real sensor. Alternative team tasks
Characteristics of sensors	Resolution and sensitivity - analysis of a range of circuits, calculations for some real sensing circuits.
Internal resistance	Measurement of the internal resistance of a power supply - practical task. Calculations
Electric Power	P=VI and alternative forms of the equation. Calculations.
Uncertainties	Rules for dealing with uncertainties, uncertainties examples, uncertainties practical task
	Checklist for Chapter 2
Quality of measurement coursework task	Topic list, Planning sheet, powerpoint - halfway stage, Notes on writing the report