IB DP Physics: HL复习笔记11.2.6 Diode Bridges
Diode Bridges Most electronic devices cannot use alternating current, they require direct current instead This is possible by use of a rectifier Rectifiers convert alternating current (ac) to direc...
IB DP Physics: HL复习笔记11.2.5 AC Electrical Power Distribution
AC Electrical Power Distribution Energy losses due to the heating of transmission lines in national power grids are significant This is because the electrical energy is transmitted across long dist...
IB DP Physics: HL复习笔记11.2.4 Transformer Calculations
Transformer Calculations The transformer equation is: Where: Ns = number of turns in the secondary coil Np = number of turns in the primary coil εs = output voltage from the secondary coil (V) εp =...
IB DP Physics: HL复习笔记11.2.3 Step-Up & Step-Down Transformers
Step-Up & Step-Down Transformers A transformer is A device that changes high alternating voltage at low current to low alternating voltage at high current, and vice versa This is designed to re...
IB DP Physics: HL复习笔记11.2.2 Root-Mean-Square Current & Voltage
Root-Mean-Square Current & Voltage Direct current sources provide a constant voltage and current over time, making it easy to measure In situations involving alternating voltage and current, th...
IB DP Physics: HL复习笔记11.2.1 AC Generators
AC Generators If a coil of wire is rotated inside a magnetic field by an external force, an emf will be generated in the wire which causes current to flow within the coil The generator effect can b...
IB DP Physics: HL复习笔记11.1.4 Lenz’s Law
Lenz's Law Lenz’s Law is used to predict the direction of an induced e.m.f in a coil or wire Lenz's Law is summarised below: The induced e.m.f is set up in a direction to produce effects that oppos...
IB DP Physics: HL复习笔记11.1.3 Faraday’s Law
Faraday's Law Faraday's Law connects the rate of change of flux linkage with induced e.m.f It is defined in words as: The magnitude of the induced e.m.f is directly proportional to the rate of chan...
IB DP Physics: HL复习笔记11.1.2 Induced Emf
Induced Emf Electromagnetic induction is a phenomenon which occurs when an e.m.f. is induced when a conductor moves through a magnetic field When the conductor cuts through the magnetic field lines...
