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authorstandenboy <standenboy@seacrossedlovers.xyz>2023-12-15 10:19:20 +0000
committerstandenboy <standenboy@seacrossedlovers.xyz>2023-12-15 10:19:20 +0000
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diff --git a/electronics/notes/1 b/electronics/notes/1
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+really simple first lesson, talked about what a current actually is
+
+also talked about basics of circuits:
+eg:
+ cell long line is posative short line negatie, remeber that a - is short
+ current flows from posative to negative but electrons themselfs flow negative to posative.
+ thats being caused by people assuming thing flow one way before mesuring them
+ conventional current reffers to there posative to negative NOT THE FLOW OF ELECTRONS
+
+we also did some practical, where we built a circuit with a bulb
+we learnt how to use the multi meters
+how to:
+ put one input into the com (common port) and another goes into the coresponding wire you want to use
+ 10 amp (probably never used) is the far left
+ mamps is the second from left
+ common is third from left
+ voltage is fouth
+ turn the thing to where it is needed, a wavey line is ac, straight is dc
+ if working with low volts/amps turn it down to mvolts or mamps
+
+we also learnt more about the rest of the course
+notable bits:
+ we will start course work in second year
+ first few weeks is just gonna be gcse recap
+ then something about digital logic, sounds fun
+ sheet about that in folder
+ we will have done some of the second year stuff in year 1 to give us time for course work
+
+we also joined the teams thing
diff --git a/electronics/notes/2 b/electronics/notes/2
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+use these to convert to the standard unit
+ie:
+ 1km = 1 x 1000 meter
+ 1mV = 1 / 1000 volts
+
+G = giga = x 1,000,000,000 = x10^9
+M = mega = x 1,000,000 = x10^6
+k = kilo = x 1000 = x10^3
+m = milli = / 1000 = x10^-3
+u (funny u (mu)) = micro = / 1,000,000 = x10^-6
+n = nano = / 1,000,000,000 = x10^-9
+p = pico = / 1,000,000,000,000 = x10^-12
+
+you can do the inverse of those to convert to a more reasonable scale
+ie:
+ 120,000V = 12kV
+ 0.15A = 150mA
+
+first half of the lesson was learning those and touching up on standard form
+
+second half we are going over current and voltage
+
+current is the rate of flow of charge, to find the current, i = q/t with i being current, q is culombs and t is time
+AMETERS GO IN SERIS
+
+voltage is the energy tranfered per unit of charge
+v = e/q with v being volts, e being energy, and q being culombs
+VOLTMETER GO IN PARRALEL
+
+later on we are doing practical, mesuring voltage with circuit with a bulb or a resistor
+plotted the results on a graph, my resistor graph was perfectly liner
+and my bulb graph is more similar to a cubic graph
+ -
+ /
+-
+kind of like that
+
+we looked at a bit of resistance at the end, worksheet work (BRING IT TO THE NEXT LESSON)
diff --git a/electronics/notes/3 b/electronics/notes/3
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+((1/r)+(1/r)+(1/r))^-1
+that is the total resistance of the circuit if it is in parralel
+we did this cool practical with a box to see where resistors are
+when you have resistors in series the supply voltage is shared un evenly across the resistors
+the sum of the voltages across the resistor will add up to the voltage from the power suply
+if the resistors are of the same resistance the voltage will be an even split
+greater voltage will go across the larger resistor
+each component has the has an equal proportion of the total voltage compared to the proportion that the resistor is to the total voltage
+
+(r1 / rt) = the proportion in restance
+
+voltage across a componet = (r1 / rt) x VoltageTotal
+
+kirchoff's first law, is that the current in all parralel branches adds up to the total current
+his second law is that the sum of the energy in point equals the sum of potential differences around any loop of a circuit
diff --git a/electronics/notes/4 b/electronics/notes/4
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+the sum of currents into a node = the sum of currents exiting the node - kirchoffs first law
+the sum of the emf equals the sum of the potential differences across a loop - kirchoffs second law
+
+the emf is the voltage across a power supply
+
+remember that when a wire splits into 2 parralel branches its current splits while the voltage stays the same
+
+this is because voltage is a mesure of energy per unit of charge, which wouldn't change because each electron has the same charge.
+the current splits because its a way of messuring the amount of charge flowing
+
diff --git a/electronics/notes/5 b/electronics/notes/5
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+mosfet's
+(metal oxide semiconducting feild effect transistor)
+voltage controled device
+has a:
+drain equivilant to the collector on a transistor
+gate the base
+source the emmiter
+
+no current can flow into the gate
+
+its just a new kind of transistor for the most part
+differences between transistor:
+ when it is on, it still conducts slightly (about 0.4V)
+ this is because it has a slight resistance, whereas a transistor does not
+ the small resistance it has is given the name Rdson (something about resistance when on (r d s on))
+ there is a formula for this in the formula sheet
+
+ a mosfet will start to conduct when the input voltage is 3V unless the question says otherwise
+
+ when ploting a graph of a mosfet, with Vin and I at the drain (Id) the gradient of that line is called gm
+ Id = gm * (Vin - 3)
+ gm is called the transconductance
+
+ the gm and rdson are propertys of the mosfet