capacitance
kuh-PASS-i-tuhnss
/kəˈpæsɪtəns/
The ability of a system or component to store an electric charge.
Capacitance refers specifically to storing energy in an electrostatic field between two closely spaced conductors, distinct from chemical storage in batteries.
The story behind the word. Derived from the Latin capere, meaning 'to take, hold, or contain' (which also gives us 'capacity'). It was adapted in the 19th century to describe the ability of a device to 'hold' an electrical charge.
Word relationships
- charge storage: Charge storage is a descriptive phrase, whereas capacitance is the formal, quantifiable physical property measured in Farads.
Commonly confused with
- inductance: Capacitance stores energy in an electric field, whereas inductance stores energy in a magnetic field.
Word family
- capacitor (noun): A component used to store electrical charge.
- capacitive (adjective): Relating to or characterized by capacitance.
Collocations
- stray capacitance
- parasitic capacitance
- measure capacitance
- high capacitance
Example sentences
- "Modern smartphone touchscreens rely on the capacitance of your finger to detect where you are touching." Explaining how touchscreens work.
- "The capacitance of a capacitor is increased by placing a dielectric material between its plates." A classic textbook explanation of electrostatic fields.
Memory hook
Think of 'capacity'—capacitance is the 'capacity' of a component to store electrical charge. Capacitance is the capacity for charge.
When not to use
Do not use capacitance to describe the general capacity of a battery to hold charge; battery capacity is measured in amp-hours, not farads.
Fun facts
- The glass jars used in early electrical experiments (Leyden jars) were the first capacitors, and their capacitance was originally measured in 'inches of wire'!
Related words
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