JAIMANGAL, Padminie
PHYSICS
GRADE 10 SCIENCE
SCHOOL BASED ASSESSMENT #13
2023-10-26
TITLE: Investigating I-V Relationship
AIM: To investigate the I-V relationship of a filament lamp.
THEORY:
Explain the term I-V relationship and what it demonstrates.
What do I-V characteristic curves used to determine?
State Ohm’s Law and express it mathematically using an equation. Explain the equation.
MATERIALS AND APPARATUS:
 Rheostat/ variable resistor
 Filament lamp
 Three Batteries
 Ammeters
 Voltmeters
 Connecting wires
 A switch
 Stationery
DIAGRAM :
The diagram above shows how the various components were connected
METHOD:
1. The circuit was set up as shown in the diagram with the rheostat set at maximum.
2. The current, I, reading was recorded from the ammeter and the voltage, V, on the
voltmeter was also recorded.
3. The rheostat was adjusted in order to obtain seven more pairs of current and voltage
reading over the widest possible range.
RESULTS:
The table below shows the results obtained from the experiment
Voltage, V/V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Current, I/A
0.0
GRAPH:
Title: Graph of Current, I against Voltage, V.
DATA ANALYSIS:
Calculating the gradient of the graph:
m = y2 –y1
x2 – x1
m=
A
V
m=
A/V
The gradient of the graph is 0.09 AV-1
DISCUSSION:
The gradient,m, of the graph represents
m = quantity plotted on the y - axis
quantity plotted on the x – axis
= current
Voltage
=I
V
=
I
R
Therefore, the gradient represents I
R
Explain what it means when a resistor is ‘ohmic’ and what it indicates in relation to the graph of
voltage versus current. Use illustrations.
Explain what it means when a resistor is ‘non-ohmic’ and what it indicates in relation to the
graph of voltage versus current. Use illustrations.
PRECAUTIONS:
POSSIBLE SOURCES OF ERROR:
LIMITATION:
CONCLUSION: