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)
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To calculate ????
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Page where
equation is discussed |
R(total) = R1 + R2 + R3 |
To find the total resistance in series |
Click here |
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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 |
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P = V2 / R, P = I2R |
As above but this set are new to the Advanced level. |
Click here |
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To calculate the voltageout relative to the voltagein
with regards to a potential divider where R1 and
R2 represent the resistance value either side of the centre. |
Click here |
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To calculate the RMS of a voltage which gives the
same heating effect as a direct current of the same numeric value. |
Click here |
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To calculate the value of a capacitor from area
and separation of the plates, permittivity of dielectrics |
Click here |
T=CR |
To calculate the charging and discharging of a
capacitor in a CR circuit |
Click here |
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To calculate the effective total capacitance of capacitors linked in
parallel, |
Click here |
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To calculate the effective total capacitance of a number capacitors linked
in series |
Click here |
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To calculate the effective total inductance of a number inductors linked
in series |
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 |
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To calculate the inductive reactance for a known
frequency and known inductance. |
Click here |
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To calculate the capacitive reactance for a known
frequency and known inductance.
|
Click here |
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To calculate the impedance from a combination of
resistance and reactance. |
Click here |
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voltages in a series circuit the current is common for the resistor and
to the capacitor |
Click here |
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To find Q knowing frequency, capacitance and dynamic resistance |
Click here |
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To calculate the frequency of resonant a tuned circuit knowing the value
of the inductance and capacitance. |
Click here |
 and
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To calculate the Q factor ( quality Factor) knowing the value of the
frequency, inductance and capacitance. |
Click here |
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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 |
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To calculate the dynamic resistance
RD knowing the value of the resistance, inductance and capacitance |
Click here |
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Formulas relating transformer primary
Np and secondary Ns turns to primary and secondary
potential differences Vs Vp and currents Ip
Is |
Click here |
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Formula relating transformer primary Np
and secondary Ns turns to primary and secondary impedances
Zp Zs |
Click here |
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The equations relating to decibel power
ratios. |
Click here |
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The equations relating to decibel and voltage
ratios. |
Click here |
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To calculate gain of Yagi over a dipole |
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 |
c = 3 x 108 m/s |
speed of light |
Click here |
Z02 = Zin X
Zout |
The formula relating Z0 = the impedance of the quarter-wave
length of feeder matching line to the impedance of the antenna Zin
and the impedance of the antenna Zout from the matching line |
Click here |
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The calculation of standing wave ratio (SWR) by
reference to VFORWARD and VREVERSE |
Click here |
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To calculate the field strength in volts /m given
the ERP and distance from the antenna. |
Click here |
erp = power x gain (linear) |
To calculate the Effective Radiated Power (erp) from an antenna |
Used in the Intermediate course |
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To calculate return loss |
Click here |
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To calculate the out going frequency from a frequency synthesizer. |
Click here |
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To calculate the frequency step from the crystal frequency. |
Click here |
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The two equation mean the same hfe =
and is used to calculate the gain or current of a transistor. |
Click here |
