W9_parallel_resonance.eps

190 Week 5: Resistance

Homework for Week 5

Problem 1.

Physics Concepts

Make this week’s physics concepts summary as you work all of the problems in this week’s
assignment. Be sure to cross-reference each concept in the summary to the problem(s) they were
key to. Do the work carefully enough that you can (after it has been handed in and graded) punch
it and add it to a three ring binder for review and study come finals!

Problem 2.

V

R

R

R R

R

R

R

Find the current through each resistor with a voltageVis placed

across the resistance network as shown to the left. Note that allof

the resistancesRare equal. You’ll basically need to use the series

and parallel rules for adding resistances several times, as well as

Ohm’s Law and Kirchhoff’s junction rule. (Hint: You may find it

useful to imagineV = 18 volts andR= 1 ohm. This makes the

numbers easy.)

Problem 3.

5 Ω

1 Ω

1 Ω

10V 2V

I 2 I

I 1

3

Find the currentsI 1 ,I 2 , andI 3 in the circuit above.