Electricity and Magnetism

Most multimeters can function as ohm meters, for measuring resistance directly. They apply a small voltage to the component...

Teaching Guidance 16-19

Class practical: a minute current in the base-emitter circuit is used to control a much larger current in the collector...

Practical Activity 14-16

Class practical: a problem-solving activity, using the concept of resistance in the context of a concert sound system.

Practical Activity 14-16

Class praticals: determining resistance from measurements of potential difference (p.d.) and current.

Practical Activity 14-16

Demonstration: an approach to Ohm's law in a quick demonstration.

Practical Activity 14-16

Class practical: this experiment looks at the relationship between current and potential difference (p.d.) for a length of...

Practical Activity 14-16

Demonstration: solutions may show ohmic or non-ohmic characteristics.

Practical Activity 14-16

Class practical: investigating the changing resistance of a wire as it heats up.

Practical Activity 14-16

Demonstration: gases conduct electricity, but they have to be ionised first.

Practical Activity 14-16

Class practical: introduces the idea of a variable resistor, or rheostat.

Practical Activity 14-16

Class practical: an opportunity for students to discover materials which will control the current.

Practical Activity 14-16

Class practical: illustrates two ideas: electric current causes a heating effect; temperature affects the resistance of a wire...

Practical Activity 14-16