Electronics - Formulae Flashcards
1
Q
Total resistance (in series)
A
RT = R1 + R2…
2
Q
Total resistance (in parallel)
A
1/RT = 1/R1 + 1/R2…
3
Q
Voltage through resistors (in parallel)
A
V1 = V2 = V3…
4
Q
Output voltage
A
Vout = Vin x R2/R1+R2
5
Q
Total capacitance (in series)
A
1/CT = 1/C1 + 1/C2…
6
Q
Total capacitance (in parallel)
A
CT = C1 + C2…
7
Q
Ohms Law
A
V = IR Voltage = current x resistance
8
Q
Supply current through resistors (in parallel)
A
IT = I1 + I2…
9
Q
Load current
A
Load current = input current x transistor (current) gain (hFE)
10
Q
Voltage 1 in a potential divider
A
V1 = R1/R1+R2 x supply voltage (Vin)
11
Q
Voltage 2 in a potential divider
A
V2 = R2/R1+R2 x supply voltage (Vin)
