AQA A Level Physics复习笔记5.3.3 Electrical Energy & Power
Energy & Power In mechanics, power?P?is defined as the?rate of doing work The potential difference is the?work done per unit charge Current is the?rate of flow of charge Therefore...
AQA A Level Physics复习笔记5.3.2 Series & Parallel Circuits
Series & Parallel Circuits Current In a?series?circuit, the current is the?same?for all components In a?parallel?circuit, the current is split across the different branches (or junction)...
AQA A Level Physics复习笔记5.3.1 Resistors in Series & Parallel
Resistors in Series & Parallel Resistors in Series When two or more components are connected in series: The combined resistance of the components is equal to the sum of individual resist...
AQA A Level Physics复习笔记5.2.4 Required Practical: Investigating Resistivity
Required Practical: Investigating Resistivity Aims of the Experiment The aim of the experiment is to determine the resistivity of a 2 metre constantan wire Variables: Independent variable?= ...
AQA A Level Physics复习笔记5.2.3 Superconductivity
Superconductivity All materials have some resistivity - even good electrical conductors such as copper and silver Resistance means that when electricity flows through a material, it heats up...
AQA A Level Physics复习笔记5.2.2 Resistance in a Thermistor
Temperature & Resistance All solids are made up of vibrating atoms The higher the temperature, the faster these atoms vibrate Electric current is the flow of free electrons in a m...
AQA A Level Physics复习笔记5.2.1 Resistivity
Resistivity All materials have some?resistance?to the flow of charge As?free?electrons?move?through a metal wire, they collide with ions which get in their way As a result, they?transfer?som...
AQA A Level Physics复习笔记5.1.2 Current–Voltage Characteristics
Ohm's Law Ohm’s law states: For a conductor at a constant temperature, the current through it is proportional to the potential difference across it Constant temperature implies constant resi...
AQA A Level Physics复习笔记5.1.1 Basics of Electricity
Electric Current & Potential Difference Electric Current Electric current is defined as?the rate of flow of positive charge?carriers It is measured in units of?amperes (A)?or?amps ...
