Aug 23, 2023
Silicon Labs announced a new family of systems on chips (SoCs) optimized for Amazon Sidewalk, the SG23 and SG28 SoCs.
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Silicon Labs announced a new family of systems on chips (SoCs) optimized for Amazon Sidewalk, the SG23 and SG28 SoCs.
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Capacitance
If you look at some capacitors, you will see that they are marked with the value of their capacitance. The greater the capacitance, the greater the charge stored by the capacitor for a given potential difference across it. The capacitance 'C' of a capacitor is defined by:
Capacitance=Charge/Potential Difference
Or
C=Q/V, where Q is the charge stored by the capacitor and V is the potential difference across it.
The capacitance of a capacitor is the charge stored per unit of potential difference across it.
The charge on a capacitor may be calculated using the equation Q=VC, where V is the potential difference across the capacitor and C is it's capacitance.
The unit of capacitance it the farad, F. From the equation above you can see that 1F is equal to 1C of charge per 1V of potential difference (1CV^-1)
Capacitors
What is a capacitor?
Capacitors are components used in many electrical and electronic circuits. They store charge (and energy), and this means that they have many valuable applications.
All capacitors have two leads, connected to two metal plates where the charge is stored. Between the plates is an insulating material called the dielectric.
Charging Capacitors
To charge a capacitor, it must be connected to a voltage supply. The negative terminal of the supply pushes (negatively charged) electrons onto one plate, making it negatively charged. Electrons are repelled from the other plate, making it positively charged. The current in the circuit will eventually stop when the capacitor is fully charged. When this happens, the potential difference (p.d.) across the capacitor is equal to the electromotive force (e.m.f.) of the supply. Remember conventional current is concerned with positive charge, and so is opposite in direction to the flow of electrons.
Stored Charge
If one plate stores charge +Q then the other stores an equal and opposite charge -Q. We say that the charge stored by the capacitor is Q despite the total charge on the capacitor being zero (-Q+Q=0). To make a capacitor store more charge, a greater voltage needs to be applied across it and so we would have to use a supply of higher e.m.f. If we connect the leads of the charged capacitor together, electrons flow back around the circuit and the capacitor is discharged. We can use this current to power a light for example. A capacitors ability to store charge is measured by its capacitance.