CIE A Level Physics复习笔记9.2.3 I-V Characteristics
I–V Characteristics As the potential difference (voltage) across a component is increased, the current also increases (by Ohm’s law) The precise relationship between voltage and current is differen...
CIE A Level Physics复习笔记9.2.2 Ohm's Law
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 Constant temperature implies constant resista...
CIE A Level Physics复习笔记9.2.1 Resistance
Defining Resistance Resistance is defined as the opposition to current For a given potential difference: The higher the resistance the lower the current Wires are often made from copper because cop...
CIE A Level Physics复习笔记9.1.4 Electrical Power
Calculating Electrical Power In “Work, Energy and Power”, Power P was defined as the rate of doing work Potential difference is the work done per unit charge Current is the rate of flow of charge S...
CIE A Level Physics复习笔记9.1.3 Potential Difference
Defining Potential Difference A cell makes one end of the circuit positive and the other negative. This sets up a potential difference (d) across the circuit The potential difference across a compo...
CIE A Level Physics复习笔记9.1.2 Electric Current: Calculations
Calculating Electric Charge Current can also be defined as the charge passing through a circuit per unit time Electric charge is measured in units of coulombs (C) Charge, current and time are relat...
CIE A Level Physics复习笔记9.1.1 Electric Current
Defining Electric Current Electric current is the flow of charge carriers and is measured in units of amperes (A) or amps Charge can be either positive or negative When two oppositely charged condu...
CIE A Level Physics复习笔记8.2.5 The Diffraction Grating
The Grating Equation A diffraction grating is a plate on which there is a very large number of parallel, identical, close-spaced slits When monochromatic light is incident on a grating, a pattern o...
CIE A Level Physics复习笔记8.2.4 Young's Double Slit Experiment
Double Slit Interference Young’s double slit experiment demonstrates how light waves produced an interference pattern The experiment is shown below Young’s double-slit experiment arrangement When a...
