# Atefeh A. Khajekini

Office No. : EE 118

Office No. : EE 115

• ### Experiment 1: RESISTANCE

Objective:

To explore the idea of the resistance of a component.

Apparatus:

PSU 0-20V d.c variable

Project Board, pp272, 500 mA

Millimater d.c 0-100mA

Voltmeter dc 0-20V

Description:

Voltage of a resistor is directly proportional to its current. Resistors can show a tolerance which is stated on it.

• ### Experiment 2: NETWORKS

Objective:

To investigate what happens when resistors are interconnected in a circuit.

Apparatus:

PSU 0 - 20V  d.c variable

Project Board, pp272, 500 mA

Milliameter d.c 0 - 100 mA

Voltmeter dc 0-20V

Description:

According to the Kirchhoff’s current law, the algebraic sum of all currents at any junction is zero. According to the Kirchhoff’s voltage law, in a closed circuit, the algebraic sum of the voltages around the circuit is zero.

• ### Experiment 3: Thevenin

Objective:

To investigate the effects of more than one voltage source in a network.

Apparatus:

PSU 0-20V d.c variable

PSU 0-20V d.c variable

Project Board, pp272, 500 mA

Milliameter dc 0-100 mA

Voltmeter dc 0-20V

Description:

In a network that has more than one voltage source; currents at a node can be found by using only one source and making others short at each time. Adding the currents up that are found by the individual sources will give the result as original sources.

• ### Experiment 4: Power

Objective:

To find a method of simplifying a circuit in order to obtain the current flowing in one particular branch of the network.

Apparatus:

PSU 0-20V d.c variable

Project Board, pp272, 500 mA

Milliameter dc 0-100 mA

Voltmeter dc 0-20V

Description:

By obtaining the Thevenin model, circuit can be simplified.

• ### Experiment 5: Superposition

Objective:

To investigate the concept of electrical power and power transfer.

Apparatus:

PSU 0-20V d.c variable

Project Board, pp272, 500 mA

Milliameter dc 0-100 mA

Voltmeter dc 0-20V

Description:

If the resistor’s value is equal to the load resistance, maximum power can be obtained.

• ### Experiment 8: CAPACITANCE

Objective:

To explore the idea of the capacitance of a component.

Apparatus:

PSU 0-20V d.c variable

Project Board, pp272, 500 mA

Milliameter dc 0-100 mA

Voltmeter dc 0-20V

Description:

At time 0, the current passing on capacitor is maximum and its voltage is minimum. When time passes on, voltage increases and current decreases.

• ### Experiment 9: TIME CONSTANT

Objective:

To investigate the factors determining the charge and discharge times for a capacitor and resistor circuits.

Apparatus:

PSU 0-20V d.c variable

Project Board, pp272, 500 mA

Oscilloscope double beam, 20Mhz

Function Generator, 2Mhz

Description:

The time taken to reach the fully charged state for the capacitor is, “ד”, the time constant. The actual value of voltage that the capacitor reaches at time “ד” is 63.2% of the supply voltage.

• ### Experiment 10: INDUCTANCE

Objective:

To explore the idea of the inductance of a component.

Apparatus:

Project Board, pp272, 500 mA

Oscilloscope double beam, 20Mhz

Function Generator, 2Mhz

Description:

Inductors voltage and the slope of the current curve are directly proportional. At time 0, the voltage of inductor is maximum and its current is minimum. After some time passes on, voltage decreases and current increases.

• ### Experiment 7: PSPICE

Objective:

Introduction to Thevenin and Operational Amplifiers.

Apparatus:

Computers in PC Lab.

Description:

Modeling Op Amps with resistors and dependent sources.

• ### Experiment 6: PSPICE

Objective:

Introduction to Pspice program.

Apparatus:

Computers in PC Lab.

Description:

Making some simulations using dependent sources.