Observing the Photoelectric Effect The photoelectric effect can be observed on a gold leaf electroscope A plate of metal, usually zinc, is attached to a gold leaf, which initially has a negative ch...
The Photoelectric Effect The photoelectric effect is the phenomena in which electrons are emitted from the surface of a metal upon the absorption of electromagnetic radiation Electrons removed from...
Capacitor Discharge Equation The time constant is used in the exponential decay equations for the current, charge or potential difference (p.d) for a capacitor discharging through a resistor These ...
Exponential Discharge of a Capacitor Charging Capacitors are charged by a power supply (eg. a battery) When charging, the electrons are pulled from the plate connected to the positive terminal of t...
Energy Stored in a Capacitor When charging a capacitor, the power supply pushes electrons from the positive to the negative plate It therefore does work on the electrons and electrical energy becom...
The Time Constant The time constant of a capacitor discharging through a resistor is a measure of how long it takes for the capacitor to discharge The definition of the time constant is: The time t...
Capacitors in Series & Parallel Capacitors can be combined in series and parallel circuits The combined capacitance depends on whether the capacitors are connected in series or parallel Capacit...
Dielectric Materials Permittivity is the measure of how easy it is to generate an electric field in a certain material The relativity permittivity εr is sometimes known as the dielectric constant F...
Capacitance Capacitors are electrical devices used to store energy in electronic circuits, commonly for a backup release of energy if the power fails They are in the form of two conductive metal pl...
