Note : Manipulation of the equation
to find the missing item may be needed in any of the following.
The mathematical notation is being used
where two letter together means multiplied
eg. P = VI is the same as P = V x I 
Equation(s)

To calculate ????

Page where
equation is discussed 
R(total) = R1 + R2 + R3

To find the total resistance in
series 
Click here 

To find the total resistance in
parallel 
Click here 
P = VI, V = IR

To calculate power, voltage, current,
or resistance given any other two. These
have been seen in the Foundation or Intermediate level courses 
Click here 

To calculate the
voltage_{out} relative to the voltage_{in }with regards to
a potential divider where R_{1} and R_{2} represent the
resistance value either side of the centre. 
Click here 
P = V^{2 }/ R, P = I^{2}R 
As above but this set are new to
the Advanced level. 
Click here 

To calculate the
RMS of a voltage which gives the same heating effect
as a direct current of the same numeric value. 
Click here 

To calculate the effective total
capacitance of a number capacitors linked in series 
Click here 

To calculate the effective total
capacitance of capacitors linked in parallel, 
Click here 

To calculate
the value of a capacitor from area and separation of the plates, permittivity
of dielectrics 
Click here 

To calculate the effective total
inductance of a number inductors linked in series 
Click here 

To calculate the effective total
inductance of a number inductors linked in parallel 
Click here 

To calculate
the inductive reactance for a known frequency and known
inductance. 
Click here 

To calculate
the impedance from a combination of resistance and reactance. 
Click here 

The supply voltage Vtotal (VT) is thus the sum of
the vectors through the Resistor VR and Capacitor VC (or Inductor) 
Click here 

To calculate
the capacitive reactance for a known frequency and known
capacitance. 
Click here 

To calculate the frequency of resonant
a tuned circuit knowing the value of the inductance and capacitance. 
Click here 
T = 1 / f and f = 1 / T 
To calculate the time period of a
sine wave at a particular frequency or the frequency knowing the time
period. 
Click here 
T=CR 
To calculate
the charging and discharging of a capacitor in a CR circuit 
Click here 
and

To calculate the Q factor ( quality
Factor) knowing the value of the frequency, inductance and capacitance. 
Click here 

Calculation of the Q of a tuned circuit,
knowing the centre frequency, and the upper and lower frequencies where the
half power points are noted. 
Click here 

To calculate the
dynamic resistance R_{D} knowing the
value of the resistance, inductance and capacitance 
Click here 

The relationship between Q and Frequency, Capacitance, and Dynamic Resistance 
Click here 

Formulas
relating transformer primary N_{p} and secondary N_{s }turns
to primary and secondary potential differences V_{s} V_{p }and
currents I_{p} I_{s} 
Click here 


Formula relating
transformer primary N_{p} and secondary N_{s} turns to primary
and secondary impedances Z_{p} Z_{s} 
Click here 

The two equation mean the same hfe
=
and is used to calculate the gain or
current of a transistor. 
Click here 

To calculate the frequency step from
the crystal frequency. 
Click here 

To calculate the out going frequency
from a frequency synthesizer. 
Click here 
c = 3 x 10^{8} m/s 
speed of light But this might be better remembered as c = 300 x 10^{6} m/s 
Click here 

The equations
relating to decibel power ratios. 
Click here 

The calculation
of standing wave ratio (SWR) by reference to V_{FORWARD }and
V_{REVERSE} 
Click here 
v =
f
c =
f
Please note that sometimes v is used
for the speed of light and at other times c. 
From the speed of the velocity of
light the wavelength can be determined knowing the frequency or the frequency
knowing the wavelength. This was first introduced to you in chart form in
the Foundation Licence course. 
Click here 

The equations
relating to decibel and voltage ratios. 
Click here 
Z_{0}^{2} = Z_{in} X_{
}Z_{out } 
The formula relating Z_{0}
= the impedance of the quarterwave length of feeder matching line to the
impedance of the antenna Z_{in} and the impedance of the antenna
Z_{out} from the matching line 
Click here 

To calculate
the field strength in volts /m given the ERP and distance from the
antenna. 
Click here 

To calculate return loss 
Click here 

Bw is the bandwidth requirement in relation
to Af is the highest modulating frequency and Δf is the carrier peak deviation frequency 
Click here 
erp = power x gain (linear) 
To calculate the Effective Radiated
Power (erp) from an antenna 
Used in the Intermediate course 

To calculate gain of Yagi over a
dipole 
Click here 
