Kapacita v cm
Moderátor: Moderátoři
Kapacita v cm
Ve staré knize je uvedena kapacita vazebního kondenzátoru oscilátoru (SW) jako 200cm. Jak se to přepočítá na standardní jednotky?
Našel:
In SI units, we measure charge in Coulombs and potential in Volts, so the unit of capacitance is the Coulomb/Volt. This combination is given a special name: the Farad, or F.
In cgs units, we measure charge in esu and potential in esu/cm. The unit of capacitance is thus just the centimeter! This is actually kind of cool: objects that are big (have lots of centimeters) tend to have a big capacitance.
It’s important to know how to convert between these two units: when we are computing capacitance from the system’s characteristics, cgs units are nice, since it’s just a matter of getting the geometry right. But SI units are used almost exclusively in circuits.
1 cm = 1.11 × 10−12 F = 1.11 pF
In SI units, we measure charge in Coulombs and potential in Volts, so the unit of capacitance is the Coulomb/Volt. This combination is given a special name: the Farad, or F.
In cgs units, we measure charge in esu and potential in esu/cm. The unit of capacitance is thus just the centimeter! This is actually kind of cool: objects that are big (have lots of centimeters) tend to have a big capacitance.
It’s important to know how to convert between these two units: when we are computing capacitance from the system’s characteristics, cgs units are nice, since it’s just a matter of getting the geometry right. But SI units are used almost exclusively in circuits.
1 cm = 1.11 × 10−12 F = 1.11 pF
