Electronics/Formulas

Conductor's Properties

Voltage

$V=\frac{W}{Q}$

Current

$I=\frac{Q}{t}$

Energy

$E=\frac{W}{t}=\frac{W}{Q}\frac{Q}{t}=V\cdot I$

Conductance

$Y=\frac{I}{V}=\frac{1}{R}$

Resistance

$R=\frac{V}{I}=\frac{1}{Y}$

Resistance and Temperture

Resistance of a conductor increase with increasing temperature

For Conductor

R = R_o + N T

For Semi Conductor

$R=R_o{e}^{N}T$

Ohm's Law

Resistance

$R=\frac{V}{I}$

Voltage

$V=I\cdot R$

Current

$I=\frac{V}{R}$

Power

$P=I\cdot V$

Power Delivered

Electric Power delivered through resistive network is equal to Electric Power Supply minus Electric Power Loss as Heat through resistance of the resistive network

Electric Power Supply

$P_v=IV$

Electric Power Loss

$P_r=I^{2}R=\frac{V^2}{R}$

Electric Power Delivered

$P=P_v-P_r$

$P=IV-I^{2}R=I(V-IR)$

$P=IV-\frac{V^2}{R}=V(I-\frac{V}{R})$

Work Done

$W=P\cdot t$

$W=F\cdot s$

$W=F\cdot s\cdot \cos \theta$