HWK 35 (Parallel Circuits: SOLUTIONS)
(due Monday 4/16/07)
SAR Physics
AM Kolchin
•
Read chapter 35: sections 35.6 through 35.7 (pages
555558) Answer questions: 11, 12, and 13.
•
Do this worksheet
.
You must show your work using an
equation and units in order to get full credit.
Rules for Parallel Circuits
:
1. In a parallel circuit, current divides to ﬂow through
the diferent branches.
The total current equals
the sum of the currents in all of the branches.
2.
The voltage drop across each resistor is the same.
3. Ohm’s Law (
V
=
IR
or
I
=
V/R
) can be applied
between any two points in a circuit.
4. The resistances can be replaced by an ”equivalent resis
tance” that leaves the current unchanged. It is Found
as Follows:
1
R
EQ
=
1
R
1
+
1
R
2
+
1
R
3
+
....
1
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are:
R
1
= 2 Ω
R
2
= 2 Ω
R
3
= 4 Ω
A voltage of:
V
T
= 120
V
is maintained between points a and b.
2
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 Spring '08
 Staff
 Physics, Work, Resistor, Electrical resistance, Circuit breaker, Apply Ohm

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