Aim:
Our aim is to see the relationship between voltage of a
circuit to it’s resistance and current.
Hypothesis:
1.
If voltage increases, current increases.
2. If
resistance increases, current decreases.
Theory
Background:
Voltage is the electric potential energy. It is
measured in volts (V). With Ohm’s
Law, we know that we can find the voltage in a circuit by finding the product
of the circuit’s resistance (R) and current (I). The resistance is measured in
ohm (Ω) while the current is measured in ampere (A).
Manipulative
Variables:
·
Independent:
Voltage and resistance of the circuit
·
Dependent:
Changes in current of the circuit
·
Controlled:
Formula
Materials:
·
Formula
Method:
1.
Open the simulation website
3.
Try to increase the voltage and resistance
4.
Observe the change in current
5.
Fill in the table with the simulation (convert
the milliamps into ampere)
Data:
Increasing the voltage
Increasing the resistance
Table
V
|
I
|
R
|
8.0 V
|
0.01 A
|
800 Ω
|
2.0 V
|
0.044 A
|
45.45 Ω
|
2.494 V
|
0.0058 A
|
430 Ω
|
6.9 V
|
0.069 A
|
100 Ω
|
6.4 V
|
0.021 A
|
300 Ω
|
Analysis:
In the simulation, it is shown that when we increase
the voltage, the current will increase as well. However, when we increase the
resistance, the current will decrease. We also prove this in the table.
Circuits with higher voltage have higher current and circuits with higher
resistance have less current.
Conclusion:
1.
Thin filaments have very high resistance.
2. The
resistance of a car stereo with 12V battery and operates 25amp is 0.48Ω
3.
The
current of a flashlight bulb that runs on 3.0V with a resistance of 15Ω is 0.2A
4.
To
charge an iPod with 0.85Amps and 35Ω, the charger must provide
29.75V
5.
It’s
not a good idea to use four 50 ft cords just to exceed a length of 200ft. If we
use four cords, then the resistance will be four times higher. With higher
resistance, the voltage will decrease four times as well. With less voltage, it
won’t be enough to power the stereo.
Resources:
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