The
algebraic sum of currents
entering and leaving any
point in a circuit must
equal zero.
Stated
another way
No matter
how many paths into and out
of a single point all the
current leaving that point
must equal the current
arriving at that point.
Kirchhoff's
Voltage Law
The
algebraic sum of the
voltages around any closed
path is zero.
Stated
another way
The voltage
drops around any closed loop
must equal the applied
voltages.
When voltages are opposing
as seen at the right, the
difference is the voltage
applied to the circuit. In
this case 4 volts must be
dropped by the resistors to
equal the applied voltage.
