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Morgan State University
School of Engineering
Department of Electrical and Computer Engineering
EEGR 203: Introduction to Electrical Laboratory
Instructor: Dr. Gregory M. Wilkins
Lab (5): V-I Relationships of Diodes and Resistor Networks
Lab Partners:
Name 1: Student 1__________________________
Name 2: Student 2__________________________
Name 3: Student 3__________________________
Date Submitted: _______________________________
Introduction
The purpose of this lab is to make use of constant voltage and
constant current sources, as well as digital multi-meters to
measure voltage and current. Voltage (V) vs. Current (I)
characterization of a resistor, a forward-biased diode, and various
series resistor-diode configuration will also be performed. Ohm's
Law and Kirchhoff's Law will also be verified.
Theory
The behavior of elements of an electrical circuit effects on the
relation between the Voltage and Current. This effect may be
grouped in two categories: Linear and Nonlinear.
The Linear elements will be most concerned in the network
analysis. The Linear element means that the voltage across an
element is proportional to the current flowing through an element
(Ohm's Law). The change in voltage whether increase (decrease)
retaliate increase (decrease) on the current and vice versa. The
study of Linear and Nonlinear elements at network analysis will be
on the most common element Resistor for Linear elements.
Resistor
It is one of the most common linear elements. The resistor is used
to limit the current that flow in the branches of the circuit or divide
voltages or currents in the circuit. In the linear elements, the
polarity of the applied voltage does not affect the magnitude of the
current that flow through it. The symbol foe a resistor is illustrated
in figure (1) blow.
Figure (1) illustration of Ohm's Law
In the nonlinear, the voltage dose not increases very greatly as
the current the current increase and vice versa. Diode is the most
common nonlinear element.
Diode
It is one of the most common nonlinear circuit elements. Diode has
two connection modes. First mode is forward biased when a
positive voltage is applied between the anode and cathode, the
current flows through the diode. Second mode is revers biased
when the voltage applied is reversed, no current flows through the
diode. The diode is commonly used in power supply circuits to
convert the Ac voltage to Dc voltage.
Because of the diode is nonlinear element, the voltage across a
diode that is forward-biased dose not increase very greatly as the
current increase and vice versa. It is another property of a diode.
Thus, diode may be used as constant voltage reference. The
voltage a forward-biased diode is from 0.6 to 0.9 volts. The symbol
for the diode is illustrated in figure (2). Diode is forward biased
when the anode is more positive terminal.
Figure (2) schematic representation of Diode
Equipment
• Variable power supply
• Multi-meter
• Diode
• 1.5 kΩ Resistor
Procedure:
Part (I): V vs. I Characteristic – Resistor
- Connecting the circuit as illustrated in figure (3).
- Connecting the voltmeter in the multi-meter in parallel with
the resistor and depressing it in DC volts key. The ammeter
in the multi-meter is connected in series with the resistor and
depressing it in DC mA key.
- Increasing the output of the power supply from 0 to 10 volts,
with one volt increments. Taking the voltage and current from
the multi-meter and record the data in Table 1A.
- Reverse the polarity of the power supply by interchanging its
terminal, and repeat the last step. Recording the data in
Table 1B
Figure (3) V-I characteristic of Resistor
Part (II): V vs. I Characteristic – Diode
- Connecting the circuit as illustrated in figure (4)....