## PHYS345 Electricity and Electronics

**Hints for 9/3 Assigment**

**Hint for P2.4**
a. Simple application of Ohm's law.

b. Voltage across the resistor is unchanged from part a. What is the new current?

c. Now current is unchanged from part a, but the voltage across the resistor is lower.

**Hint for P2.7**
For each case, the current in the line can be determined from the delivered power and voltage.

*(There were a lot of hints already given in the problem statement...)*

**Hint for P2.14**
How can you make an 8 ohm resistor from 10 ohm resistors?
Since it is a lower value, there must be a parallel configuration involved...

**Hint for E2.6**
Start by determining the maximum allowed temperature rise.
The power associated with this temperature rise can be determined from
2.3 watts/degree.

"http://www.physics.udel.edu/~watson/phys345/protected/exercises/hints/0903.html"

Last updated Sept. 4, 1998.

Copyright George Watson, Univ. of Delaware, 1998.