## DC Machines and Equivalent Circuits

Separately Excited \( I_A \neq I_F \) Separate supplies for field and armature $$ T = K_T \cdot I_F \cdot I_A $$ $$ I_F = \frac{V_F}{R_F} $$ $$ E_

Separately Excited \( I_A \neq I_F \) Separate supplies for field and armature $$ T = K_T \cdot I_F \cdot I_A $$ $$ I_F = \frac{V_F}{R_F} $$ $$ E_

Flux Density: $$ B = \frac{\Phi}{A} $$ Where \( B \) is the flux density (Teslas, \( T \)), \( \Phi \) is the magnetic flux (Webers, \( Wb \)), \( A \) is the cross-sectional area. Permeability: $$ \mu _r = \frac{

This investigation attempts to calculate the viscosity of water using Poiseuille's equation. With temperature kept relatively constant (10 $^\circ$), the factors length and radius of the capillary along with the