Midterm #1 Formulas Flashcards

Question 1

Ohm's Law

Accepted Answer

$$V=IR$$

Question 2

Generalized Power Law

Accepted Answer

$$P=VI$$

Question 3

Current Density

Accepted Answer

$$J = \frac I A$$

Question 4

Resistivity and Conductivity

Accepted Answer

$$ \boxed{R=ho \frac L A}
\~\ \boxed{\sigma= \frac 1 ho}$$

Question 5

Series resistors

Accepted Answer

$$R_{eq}=R_1+R_2+\dots+R_n$$

Question 6

Parallel resistors

Accepted Answer

$$R_1||R_2 \longrightarrow \frac {R_1R_2}{R_1+R_2}$$

Question 7

Voltage divider

Accepted Answer

$$V_{out}=V_{in} \frac {R_{lower}} {R_{lower} + R_{upper}}$$

Question 8

Kirchhoff's Current Law

Accepted Answer

$$\Sigma I_{in}=\Sigma I_{out}$$

Question 9

Kirchhoff's Voltage Law

Accepted Answer

$$\Sigma \Delta V = 0$$

Question 10

Current divider

Accepted Answer

$$I_X= I_{total} \frac {R_{total}} {R_X + R_{total}} $$

Midterm #1 Formulas