4.1. Part A: Ohm's law This part aims at checking and proving Ohm's law. Using the fixed 5 V output from the power supply, the 1k, 2 k and 5k2 resistors, and considering all the possible unique circuit combinations with these 3 resistors only, conduct the followings: 1. Before the lab session and manually a) design and manually sketch your various circuits using the fixed 5 V power supply (i.e. put the resistors in various parallel or series combinations), b) calculate the current (immediately after the power supply) for all your circuits and find the current and the power dissipated in each of the 3 resistors, c) rank the circuits from maximum to minimum current observed immediately after the power supply, and

c) b) Figure. Q2.a below shows two circuits (basic and Widlar current-mirrors) are designed to generate a constant current lo = 10 μA operate from a 10-V supply. Determine the values of R₁, R2, and RE assuming that VBE 0.7V at a current of 1 mA. Vcc= 10V VBE1 Tref R₁ le lot TI le VBE2 lo Figure. Q2.a Basic circuit I, R T2 R1 R₂ Iref Ici Vcc VB61 Consider the circuit shown in Figure Q2.b and show that lo R2 I, R₁ - 1 ~ VT m²/ In Ir-R1 Io -Vcc= 10V VBE21 Τ1 Widlar current-mirror circuit Maar R₂ 9 Figure Q2.b T2 RE - OV 2000 2000-331 What is a noise signal in differential amplifier analysis? Discuss how this signal can be minimized/attenuated.

Consider the circuit in the given figure. Assume R1 = 120 S and R2 = 260 N. R R2 40 V Calculate current i in the given figure when the switch is in position 1. The current when the switch is in position 1 is mA.

How to do using variation parameter method ?