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...
Capacitors & Diode Bridges In?rectification, to produce a steady?direct current? or voltage from an?alternating current??or voltage, a?smoothing capacitor?is necessary Smoothing is defined as: ...
