Dielectric
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Key Stage 5
Meaning
A dielectric is a material that increases the capacity of a parallel-plate capacitor to store charge when placed between the plates.
About Dielectrics
- Dielectrics increase the capacitance of a capacitor by reducing the electric field between the plates.
- Common dielectrics include polythene, waxed paper, and ceramics.
- The ability of a dielectric to increase capacitance is measured by its relative permittivity or dielectric constant.
- Dielectrics are used to prevent electrical breakdown and improve energy storage in capacitors.
- Dielectrics also influence the electric field distribution and energy storage in the capacitor.
Examples
- Polythene used as a dielectric in high-voltage capacitors.
- Ceramic dielectrics in multilayer ceramic capacitors (MLCCs) for electronic circuits.