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Glossary of Terms > P
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A closed electrical circuit in which the current is divided into two or more paths and then returns via a common path to complete the circuit.
A particle of light.
A small container comprising two straws and a collection chamber used to collect small insects.
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The energy stored in a particular system. A stretched spring has potential energy whilst it is being held. When released it will return to its original length.
A triangular glass or plastic block used to split light into its individual spectral colours.
Subatomic particles found in the nuclei of atoms. Have a positive charge (+1) and a relative mass of 1.