What is the Coulumb
symbol C, although it is used as a measure of charge in electrostatics, it is defined by considering the size of the current measured in a wire through which one coulomb of charge flows through per second
How do you calculate the amount of charge passing at a given time
is the product of the current and the time
12/05/2025 (topic 3 electircal cicuits)
What is Resistence?
Is a numerical quanitity that can be measured and expressed mathematically. The standard uniy for resistance is the ohm, represented by the Greek letter omega Ω
What s the equation representing the dependency of the resistance R of a cylindrically shaped conductor
R = p (L/A)
where l represent length of wire (m), A represent cross sectional area of the wire (m^2), P represents the resistivity of the material
Ohm’s Law
Ohms law shows the relationship between current and voltage (V=IR)
What is the graphical representation of Ohms law?
If we plot a graph of Voltage vs current we get a linear graph of gradient R (R=V/I)
Non Ohmic Conducter?
The resistance is not constants, hence the voltage current graph for a non-ohmic resistor is not linear
Formula for POwer
P = VI
P = V^2 / R
P=I^2 / R
What is the unit for Power)
Watts
What is the unit for Work?
Joules
Formula for work?
W=QV
What are series Circuits?
There is only one path that the current can flow
What is a parallel circuit
There are 2 paths that run concurrent to eachtoher
Resistence in series?
Add them together (R1+R2+R3) = Rtotal
Resistors in parallel
1/Rtotal = 1/R1 + 1/R2
What is a wavelength?
Distance from crest to crest or trough to trough
What is a period?
What are the models of light?
The ray model
What is the ray model
Light is generally drawn or described using a system of arrows and diresction
What is the wave model
Describes how light propagates in the same way as we model ocean waves moving through the water
What is the partical model
Required to gain an understanding of how light interacts with atoms. Here light is thought of as photons
What is the Electromagnetic Spectrum
gamma ray, xray, ultraviolet, visible, infared, microwave, radio
Electromagnetic radiation can be expressed in terms of energy, wavelength or frequency
What is polarisation?
Making the light waves into 1 direction (1D)
