Technical data

22
hm’s Law
elationship of Power to V with a Constant R
roject Objectives:
• To show the use of the power formula by demonstrating how power is related to voltage
squared for a set resistance.
• To obtain practice in connecting circuits and using a DMM to make measurements.
ems Needed:
- Electronics Trainer - Digital multi-meter
- Jumper Wires - 10k  resistor
• While completing this project, keep in mind that the power formula states that (P = E x I)
• Be sure to disconnect power when connecting meters and making component chan
O
R
P
It
ges to the
circuit!
Experiment
2. e Source V to obtain 1mA of current and measure
the voltage.
______________________ mA
Voltage = ______________________ V
3. Using the power formula, calculate the power dissipated by
the resistor.
Calculated Power = ______________________ mW
4. Change the Source V to obtain 2mA of current and measure the voltage. Using the power
formula, calculate the power dissipated by the resistor.
Current now = __________________ mA Voltage now = __________________ V
_____ mW
many times? ______________.
______ tim
1. Connect the circuit shown in figures 6-1 and 6-2.
Adjust th
Current =
Calculated Power now = _________________
5. When we doubled the voltage the current increased by how
Therefore the product of V x I increased
______ es.
+
−
mA
10
k
Ω
Source V
Figure 6-2
0.00
A
m
A
COM
V
Ω
+
−
Variable
voltage
output
10
k
Ω
terminal
mA
Variable
0 to -20vdc
Variable
0 to +20vdc
Figure 6-1