Solving problems with parallel circuits

connected in series is made easier by

drawing simplified circuits.

Remember, when working with resistances

connected in parallel, use parallel-circuit

laws; and when working with resistances

connected in series, use series-circuit laws.

Figure A

Figure B

NOTE:

The simplified circuit is a series

circuit; therefore, Rt is found by

adding the values of Ra and Rb (series-

circuit law for total resistance).

a.

The circuit in figure A consists of

___________ parallel circuits connected

in series.

b.

Ra (figure B) represents the combined

value of the parallel network of which

resistances? ______________

c.

Rb (figure B) represents the combined

value of the parallel network of which

resistances? ______________

d.

What is the value of Ra?

____________

e.

What is the value of Rb?

____________

f.

Rt = ____________ ohms