Introduction to inductance (0526)

Introduction to Inductance

First, we reviewed the Faraday's Law of the inductance. Here we wrote the wrong equation. It should be L= flux B /I. We also need to get 100 ohms resistor, which has the color code of brown black brown.

Here first we were trying to find the resistance of the coil using rhp*length/A. Since B of toroidal solenoid is B= miu_not*N*I / (2*pi*R), we derived L as seen above.

After we found the inductance L=miu_not*N^2*A/l

Our approximation is about 72 turns, which more 22 turns compared to 50 turns of the solenoid

WE used 40khz, with 2V and 0.02A as our source.

Here Professor Mason uses the formula of growing current in L-R circuit. He first calculated I_max and I_0. then use I(t)=Imax*(1-e^-t/tau)

Here we did almost the same as Professor Mason did. But since V mas is 0 not emf. This way is wrong mathematically.

Here we were trying to find the potential energy in this circuit, the time is 170us. The U_1 is belong to the inductor= 0.5*L*I^2, since the time is pretty quick, we can assume that the power dissipated in R_1 is negligible. Therefore, U_2=V_2^2/R*t.