D.C. CIRCUITS AND OHM’S LAW
Ohm’s Law:
|
V
|
=
|
IR
|
or
|
I
|
=
|
V
|
R
|
|||
or
|
R
|
=
|
V
|
I
|
|||
Heating Rate:
|
=
|
I2R watts (W)
|
INDUCTANCE
Back-emf E
|
=
|
-L
|
di
|
dt
|
Stored Energy:
|
=
|
½LI2
joules (J)
|
|
Time Constant
|
=
|
L
|
seconds
|
R
|
CAPACITANCE
Stored Energy:
|
=
|
½CV2
joules (J)
|
|||
Time Constant
|
=
|
CR
|
seconds
|
Capacitances in series
|
1
|
=
|
1
|
+
|
1
|
+
|
1
|
+
|
….
|
C
|
C1
|
C2
|
C3
|
Capacitances in
parallel
|
C
|
=
|
C1
|
+
|
C2
|
+
|
C3
|
+
|
….
|
RESISTANCES IN SERIES AND PARALLEL
Resistances in
series
|
R
|
=
|
R1
|
+
|
R2
|
+
|
R3
|
+
|
….
|
Resistances in
parallel
|
1
|
=
|
1
|
+
|
1
|
+
|
1
|
+
|
….
|
R
|
R1
|
R2
|
R3
|
D.C. POWER
Power: VI
watts
or
|
I2R
|
watts
|
or
|
V2
|
watts
|
R
|
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