IB DP Physics: SL复习笔记5.2.5 Resistivity
Resistivity Resistance, Length and Cross-Sectional Area The resistance of a sample depends on: The material it is made of The length of the sample The cross-sectional area of the sample The resista...
IB DP Physics: SL复习笔记5.2.4 I-V Characteristics
Ohm's Law Ohm's law states that: For a conductor at a constant temperature, the current through it is proportional to the potential difference across it An electrical component obeys Ohm’s law if i...
IB DP Physics: SL复习笔记5.2.3 Kirchhoff’s Circuit Laws
Kirchhoff's Circuit Laws Kirchhoff's First Law Kirchhoff’s first law states that: The sum of the currents entering a junction always equals the sum of the currents out of the junction A junction is...
IB DP Physics: SL复习笔记5.2.2 Resistance & Resistors
Resistance As electrons move through the metal wire of a circuit (or any other component), they transfer some of their electrical potential energy to the positive ions of the metal Free electrons c...
IB DP Physics: SL复习笔记5.2.1 Circuits
Circuit Diagrams The diagram below shows the various circuit symbols that could be used in circuit diagrams Common circuit symbols Functions of Most Common Components Switch: it turns the circuit o...
IB DP Physics: SL复习笔记5.1.5 Coulomb’s Law
Coulomb's Law Any charged particle generates an electric field This field exerts a force on any other charged particle within range The electrostatic force between two charges is defined by Coulomb...
IB DP Physics: SL复习笔记5.1.4 Electric Fields
Electric Fields An electric field is a region of space in which an electric charge “feels” a force It is a vector field The direction of the electric field is the same as the direction of the elect...
IB DP Physics: SL复习笔记5.1.3 Potential Difference & DC
Potential Difference Potential difference is a measure of the electrical potential energy transferred from an electron as it moves between two points in a conductor Potential difference is work don...
IB DP Physics: SL复习笔记5.1.2 Drift Speed
Drift Speed In conductors, only negatively charged (delocalised) electrons are allowed to move between atoms In general, an electric current can arise from the flow of either positive or negative p...
