Group members:
Nor Fadilah Bt Zakaria D20101037413
Nur Faralina Bt Asrab Ali D20101037415
Syazana Bt Ismail
D20101037417
Title : Data Logging (Ohm’s Law)
SSI 3013: Information and Communication Technology in Science
1) How energy is supply to a circuit ?
2) What are the differences in current flow between series and parallel circuit?
3) What will happen to resistance if the circuit is wire in series and parallel ?
4) In what way does the series circuit reduce the resistance?
5) How to build wire in parallel and series circuit?
ENGAGE
EmpowerObjectives
To experimentally verify Ohm’s Law through measurement and to confirm findings by comparing
measured values with prediction.
Measuring Instrument
Voltage/Current Sensor PASPORT Interface
Crocodile clips11.2 ohm Resistor Batteries (D Cells)
Procedure:
1. Connect the PASPORT Interface to the USB port of the computer and plug the Voltage/Current Sensor into the PASPORT Interface.
2. Construct a simple series circuit with the empty battery holder, long bulb in socket, and voltage/current sensor .
3. You are now ready to begin collecting data.
Data Collection Procedure:
4. Make sure you have good connections at each junction in the circuit.
5. Place one D cell in the battery holder; the bulb should light. If not, troubleshoot your circuit for a complete conducting path.
6. Click Start and note the readings on the voltage and current digits displays.
7. Record the voltage and current in the data table.
Result
Part 1 Resistance = 11.2 ± 0.1 Ω
DataStudio Slope: 10.8 ± 0.59 Ω
Measured Values
Voltage (Volts) Current (Amps)
0.352 0.031
0.364 0.032
0.374 0.034
0.394 0.034
0.403 0.038
0.439 0.04
0.451 0.041
0.475 0.042
0.509 0.046
0.548 0.049
Interface
Example Experiment
ENHANCE
Principles
Ohm’s Law can be written algebraically as V = IR ,
where V represents the potential drop across the
conductor (measured in volts), I the current in the
conductor (measured in amperes), and R the
resistance of the conductor measured in units called
“ohms” (symbolized by Ω, upper- case Greek
omega)
How voltage, current, and resistance relate
Relationship between current and voltage when a resistor follows Ohm's Law
The current flowing through a resistor
at a constant temperature is directly
proportional to the voltage across the
resistor. So, if you double the voltage,
the current also doubles. This is
called Ohm's Law. The graph shows
what happens to the current and
voltage when a resistor follows Ohm's
Law.
Applications
• Use in all electrical devices that need a continuous flow of electric current to function.
• Batteries and generators provide the electricity and electrical circuits provide the paths along which the current flow.
Examples of Ohm’s Law application in daily life
• Flash light• Christmas tree light bulb• Train lighting • Voltage divider• Or any of electrical
appliances….
Eg : Electric mixer and Light Dimmer Switch
• Kitchen appliances such as electric mixer and light dimmer switches operate by altering the current at the load by increasing or decreasing the resistance of the circuit.
• The effect of the resistance in the circuit that affect the current.
MORAL VALUES FROM OHM’S LAW
1. We known how to use electricity properly
2. Become more creative and innovative person
3. More appreciate the Ohm’s Law
4. Ohms Law is the a foundation stone of electronics
and electricity. Without the Ohm’s law, there will be
no electricity at all.
5. Allows us to enjoy the uses of our appliances now
such as TV, refrigerator, Players, etc.
Advantages of Data Logging
1. Better learning outcomes2. Presentation of data3. Appreciation of modern technology4. Increased level of interest among
students. 5. Data from the computer more
accurate and precise.