Magnetic Flux Density Definition The magnetic flux density B is defined as: The force acting per unit current per unit length on a current-carrying conductor placed perpendicular to the magnetic fi...
Fleming's Left-Hand Rule The direction of the force on a charge moving in a magnetic field is determined by the direction of the magnetic field and the current Recall that the direction of the curr...
Force on a Current-Carrying Conductor A current-carrying conductor produces its own magnetic field When interacting with an external magnetic field, it will experience a force A current-carrying co...
Magnetic Field Definition A magnetic field is a field of force that is created either by: Moving electric charge Permanent magnets Permanent magnets are materials that produce a magnetic field A st...
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...
Capacitor Discharge Graphs So far, only capacitors charged by a battery have been considered This is when the electrons flow from the positive to negative plate At the start, when the capacitor is ...
Calculating Energy Stored in a Capacitor Recall the electric potential energy is the area under a potential-charge graph This is equal to the work done in charging the capacitor to a particular pot...
Area Under a Potential–Charge Graph When charging a capacitor, the power supply pushes electrons from the positive to the negative plate It therefore does work on the electrons, which increase thei...
Capacitors in Series & Parallel Recall the formula for the combined capacitance of capacitors in series: In parallel: Ctotal = C1 + C2 + C3 ... Worked Example Three capacitors with capacitance ...
