# Fields 2

- Created by: l10lasan
- Created on: 16-10-16 14:57

View mindmap

- Fields
- Magnetic Fields
- Fleming's left hand rule
- Magnetic flux density & tesla
- CPAC: Investigate how force on a wire varies w. flux density, current and length of wire using top pan balance
- Moving charges in a magnetic field
- Circular path of particles
- F=BQv

- F=BIl
- Magnetic flux & flux linkage
- Rectangular coil
- Defined as equations
- CPAC: Investigate using a search coil & oscilloscope, the effect on magnetic flux linkage of varying the angle between a search coil & magnetic field direction

- Electro magnetic induction
- Faraday & Lenz's laws
- Magnitude of induced emf = rate of change of flux linkage
- Straight conductor moving in a magnetic field
- Alternating currents
- Sinusoidal voltages & currents; root mean square, peak and peak-to-peak for sinusoidal waveforms only
- Calculation of mains electricity peak and peak-to-peak voltage values
- Use of oscilloscope as dc and ac voltmeter
- Familiarity with controls

- Transformers
- Equation
- Efficiency

- Production of eddy currents
- Causes of inefficiencies
- Transmission of electrical power at high voltage
- Calculate power loss - transmission lines

- Equation

- Capacitors
- Parallel plate capacitor
- Dielectric action in capacitor
- Relative permittivity & dielectric constant
- Energy stored
- Area under graph of charge against pd

- Charge & discharge
- Graphical representation
- Interpretation of gradients & areas under graphs

- Time constant RC
- Calculation of time constants from graphical data
- Time to halve

- Quantative treatment of capacitor charge & discharge
- CPAC: Investigate charge & discharge of capacitors. Analysis techniques should include log-linear plotting leading to determination of time constant

- Graphical representation

- Parallel plate capacitor

- Magnetic Fields

## Comments

No comments have yet been made