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Electronics equations

The 13 equations the electronics notes display, each with a link to the lesson that states it. Of the 13, the data booklet prints 9 and 4 are yours to memorise.

Year 13 · 8 lessons with equations.

The marks refer to the AQA 7408 data booklet. An equation it prints is marked as such, and one it leaves out is marked to learn. An equation with no mark has not been checked against that booklet, and some of these belong to the Edexcel, OCR or CIE specification rather than AQA’s, so check them against your own board’s data or formula booklet.

8 lessons

Zener diodes and semiconductor sensors

I=VS-VZRSI = \frac{V_{S} - V_{Z}}{R_{S}}NOT IN THE AQA DATA BOOKLET: LEARN IT

Tuned circuits and the Q factor

f0=12πLCf_{0} = \frac{1}{2\pi\sqrt{LC}}IN THE AQA DATA BOOKLET
Q=f0fBQ = \frac{f_{0}}{f_{B}}IN THE AQA DATA BOOKLET

Band-pass, band-stop and RC filters

fc=12πRCf_{c} = \frac{1}{2\pi RC}NOT IN THE AQA DATA BOOKLET: LEARN IT

The ideal op-amp and the comparator

Vout=AOL(V+-V-)V_{out} = A_{OL}(V_{+} - V_{-})IN THE AQA DATA BOOKLET

Negative feedback amplifiers

VoutVin=-RfRin\frac{V_{out}}{V_{in}} = -\frac{R_{f}}{R_{in}}IN THE AQA DATA BOOKLET
VoutVin=1+RfR1\frac{V_{out}}{V_{in}} = 1 + \frac{R_{f}}{R_{1}}IN THE AQA DATA BOOKLET
gain×bandwidth=constant\text{gain} \times \text{bandwidth} = \text{constant}NOT IN THE AQA DATA BOOKLET: LEARN IT

Summing and difference amplifiers

Vout=-Rf(V1R1+V2R2+V3R3+...)V_{out} = -R_{f}(\frac{V_{1}}{R_{1}} + \frac{V_{2}}{R_{2}} + \frac{V_{3}}{R_{3}} + ...)IN THE AQA DATA BOOKLET
Vout=(V+-V-)RfR1V_{out} = (V_{+} - V_{-})\frac{R_{f}}{R_{1}}IN THE AQA DATA BOOKLET

Flip-flops, counters and clocks

fout=fin2nf_{out} = \frac{f_{in}}{2^{n}}NOT IN THE AQA DATA BOOKLET: LEARN IT

Modulation and PCM

AM bandwidth=2fM\text{AM bandwidth} = 2f_{M}IN THE AQA DATA BOOKLET
FM bandwidth=2(Δf+fM)\text{FM bandwidth} = 2(\Delta f + f_{M})IN THE AQA DATA BOOKLET

Every equation in the library is indexed by unit on the equation index, and the electronics notes are where these equations are derived and used. The 4 the booklet leaves out are on the equations to memorise, alongside the rest of the course.

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