Describes a simple exercise in percolation theory that can be performed easily and quickly in a laboratory using paper and a hole punch. (Author/MM)

A photovoltaic cell experiment utilizing the convenience of a solar simulating type lamp is described. Insight into the solid state aspect of a solar cell is gained by the student in studying the characteristics, and deducing from them cell parameters and efficiency. (Author/CS)

Explains how to determine the polarity of static electric charges by using an electrician's tool called the test pencil. (WRM)

The ratio of electronic charge to Boltzmann's constant can be easily determined by measuring the short-circuit collector current versus the emitter-base voltage characteristic of a silicon transistor connected in the common-base mode. (Author/DF)

Gives an explanation to the process of charging the conventional leaf electroscope, by induction, using a charged insulated rod. (GA)

Explains an oxidation-reduction experiment using lemon cells made from zinc and copper strips of metal placed into a lemon. (YDS)

Describes a number of experiments which give the student an opportunity to observe the effects of the electrical nature of matter without trying to explain why a given phenomenon is occurring. These experiments should be introduced before discussing the structure of atoms, and provide practical experience for later theoretical discussions. (JR)

Describes a demonstration experiment designed to estimate the equilibrium constant by comparing the conductivities of acetic and hydrochloric acids. (CC)

Students construct a Sierpinski gasket from resistors and measure its resistance as a function of size. Provides a brief review of what it means geometrically for the Sierpinski gasket to be fractal, followed by an explanation of how to analyze the electrical resistance on a gasket to find its fractal behavior. (MVL)

This book provides a short course in the mysteries of seed structure, function, and development. Chapter 1, "Backgrounds, Hints, And Tips For Teachers And Parents," provides a basis for working with the mid-years student. Chapater 2, "Where Do I Start? What Do I Do?" provides procedural tips for science research. Chapter 3,…

Presents three examples of hands-on experiments that use an inexpensive magnetic-field sensor to quantitatively study magnetic fields. (WRM)