Circuits Formulas Flashcards
1
Q
milliamps
A
1 A = 1,000 mA
2
Q
milli
A
1,000
3
Q
micro
A
1,000,000
4
Q
nano
A
1,000,000,000
5
Q
current (I)
A
Q/t or V/R or P/V
6
Q
voltage (V)
A
E/Q or R*I
7
Q
charge (Q)
A
I*t or E/V
8
Q
energy (E)
A
VIt
9
Q
power (P)
A
V*I or E/t
10
Q
resistance (R)
A
V/I
11
Q
voltage in series
A
V-total= V1 +V2 + …
12
Q
current in series
A
I-total= I1 = I2
13
Q
resistance in series
A
R-total= R1 +R2 + …
14
Q
voltage in parallel
A
V-total= V1 = V2
15
Q
current in parallel
A
I-total = I1 +I2 + …
16
Q
resistance in parallel
A
1/R-total = 1/R1 + 1/R2 + …
17
Q
power in series or parallel
A
P-total= P1 + P2 + …
18
Q
voltage divider
A
V-out= R2*V-in / R1+R2
19
Q
paying for electricity
A
cost= energy * rate
energy in Kw-h
rate is cost per Kw-h
20
Q
period (T)
A
1/f
21
Q
frequency (f)
A
1/T
22
Q
Ohm’s law
A
V= I*R
