Experiment: Investigating the Relationship Between Resistance and Current in an Electric Circuit
Materials:
Power supply
Variable resistor
Ammeter
Voltmeter
Wires
Procedure:
Set up a circuit with the power supply connected to the variable resistor.
Use the ammeter to measure the current flowing through the circuit, and the voltmeter to measure the voltage across the variable resistor.
Record the current and voltage readings in a data table.
Increase the resistance of the variable resistor by a small amount and repeat steps 2 and 3.
Repeat step 4 several times, each time increasing the resistance by a small amount, until the resistance is at its maximum value.
Plot a graph of current against resistance.
Expected results: As the resistance of the variable resistor increases, the current flowing through the circuit will decrease. This relationship can be described by Ohm's Law, which states that the current in a circuit is directly proportional to the voltage and inversely proportional to the resistance. The graph should show a negative correlation between current and resistance.
Note: Make sure you follow the safety precautions for handling the electric circuit.
To study the change of current due to variation of resistance in an electric circuit, we can perform the following experiment:
1. Set up a circuit consisting of a power source (such as a battery), a variable resistor, an ammeter (to measure current), and a fixed resistor. Connect the power source to the variable resistor, and connect the ammeter in series with the fixed resistor.
2. Record the initial reading on the ammeter.
3. Slowly increase the resistance on the variable resistor, and at each step, record the corresponding reading on the ammeter. Repeat this process until the resistance on the variable resistor is at its maximum.
4. Plot a graph of resistance (on the x-axis) versus current (on the y-axis).
5. Analyze the data from the graph to determine the relationship between resistance and current in the circuit.
6. Repeat the experiment with different values of fixed resistance.
7. In the end, this experiment should give us an idea of how the current flowing through a circuit changes as the resistance changes, which can be described by Ohm's law ( V = IR).
Answers & Comments
Experiment: Investigating the Relationship Between Resistance and Current in an Electric Circuit
Materials:
Power supply
Variable resistor
Ammeter
Voltmeter
Wires
Procedure:
Set up a circuit with the power supply connected to the variable resistor.
Use the ammeter to measure the current flowing through the circuit, and the voltmeter to measure the voltage across the variable resistor.
Record the current and voltage readings in a data table.
Increase the resistance of the variable resistor by a small amount and repeat steps 2 and 3.
Repeat step 4 several times, each time increasing the resistance by a small amount, until the resistance is at its maximum value.
Plot a graph of current against resistance.
Expected results: As the resistance of the variable resistor increases, the current flowing through the circuit will decrease. This relationship can be described by Ohm's Law, which states that the current in a circuit is directly proportional to the voltage and inversely proportional to the resistance. The graph should show a negative correlation between current and resistance.
Note: Make sure you follow the safety precautions for handling the electric circuit.
Verified answer
Answer:
To study the change of current due to variation of resistance in an electric circuit, we can perform the following experiment:
1. Set up a circuit consisting of a power source (such as a battery), a variable resistor, an ammeter (to measure current), and a fixed resistor. Connect the power source to the variable resistor, and connect the ammeter in series with the fixed resistor.
2. Record the initial reading on the ammeter.
3. Slowly increase the resistance on the variable resistor, and at each step, record the corresponding reading on the ammeter. Repeat this process until the resistance on the variable resistor is at its maximum.
4. Plot a graph of resistance (on the x-axis) versus current (on the y-axis).
5. Analyze the data from the graph to determine the relationship between resistance and current in the circuit.
6. Repeat the experiment with different values of fixed resistance.
7. In the end, this experiment should give us an idea of how the current flowing through a circuit changes as the resistance changes, which can be described by Ohm's law ( V = IR).
Explanation: