Technical data

Oh
elation ip of I an tant R
ro
To prove the direct relationship of current to voltage when a set resistance is given.
• To obta
ems Needed:
- Electronics Trainer - Digital multi-meter
- Jumper Wires - 10k  resistor (brown, black, orange)
hile completing this project, keep in mind that Ohm’s Law states (E = I x R)
• Be sure to disconnect power when connecting meters and making changes to the circuit!
• When measuring current, make sure a resistance is always in the circuit to avoid
shorting the circuit and damaging the meter.
xperiment
m’s Law
R sh d V with a Cons
P ject Objectives:
•
in more practice connecting circuits and using a DMM to make measurements.
It
W
E
18
1. Select the c range to measure dc
current from
orrect meter function and
0 to 2mA.
Ma ble voltage
off the power and disconnect the meter from the
Using Ohm’s Law, calculate the expected voltage of this
circuit.
2. Using the positive variable voltage as the source V, connect
the circuit shown in figures 4-1 and 4-2.
Make sure the meter is in series with the circuit.
3.
5.
Calculated voltage = _________________________ V.
6. Select the correct meter function and range to measure dc
voltage from 0 to 20 volts.
7. Connect the circuit and the meter to take a voltage reading
across the 10k resistor. Remember, the meter must be in
parallel when measuring voltage. See figure 4-3 for a schem
Make sure the variable voltage control knob has not been ch
set and apply power to the circuit.
.
Increase the positive variable voltage until the meter reads
1mA.
king sure not to change the state of the varia4.
knob, turn
circuit.
atic diagram.
anged from when the current was
Measured Voltage =
_________________________ V
+
−
mA
1
0k
Ω
V
Figure 4-2 Schematic Diagram
Source
+
−
V
10k
Ω
Source V
Figure 4-3
0.00
A
m
A
COM
V
Ω
+
−
Variable
voltage
output
10
k
Ω
Figure 4-1 Pictorial Diagram
mA
terminal
Variable
Variable
0 to +20vdc
0 to -20vdc