Class practical: a minute current in the base-emitter circuit is used to control a much larger current in the collector...
Class practical: a problem-solving activity, using the concept of resistance in the context of a concert sound system.
Class praticals: determining resistance from measurements of potential difference (p.d.) and current.
Demonstration: an approach to Ohm's law in a quick demonstration.
Class practical: this experiment looks at the relationship between current and potential difference (p.d.) for a length of...
Demonstration: solutions may show ohmic or non-ohmic characteristics.
Class practical: investigating the changing resistance of a wire as it heats up.
Demonstration: gases conduct electricity, but they have to be ionised first.
Class practical: introduces the idea of a variable resistor, or rheostat.
Class practical: an opportunity for students to discover materials which will control the current.
Class practical: illustrates two ideas: electric current causes a heating effect; temperature affects the resistance of a wire...
Demonstration: model a fuse using fine strands of steel wool. Too large a current causes the steel fibres to heat and melt...
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