Physics Experiment: Ohm's Law Verification

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Questions and Answers

What does Ohm's Law state about the relationship between current and voltage in a conductor?

Current is directly proportional to voltage. (correct)

Current equals the square of voltage.

Current is inversely proportional to voltage.

Current is dependent on resistance alone.

What is the formula used to calculate resistance according to Ohm's Law?

R = V/I (correct)

R = V * I

R = V + I

R = I/V

Which of the following statements is NOT a limitation of Ohm's Law?

Ohm's law is valid under constant physical conditions. (correct)

Ohm's law cannot be applied to Non-Linear circuits.

Ohm's law cannot be applied at very high temperatures.

Ohm's law cannot be applied to Uni-Lateral circuits.

What are the units of measurement for voltage, current, and resistance?

Voltage in Volts, Current in Amperes, Resistance in Ohms Signup and view all the answers

In the experimental setup to verify Ohm's Law, what is the role of the potentiometer?

To change the value of current and voltage. Signup and view all the answers

Which observation indicates that Ohm's Law has been successfully verified?

A straight line graph from the data points plotted. Signup and view all the answers

What is the purpose of the wire wound resistor in the experiment?

To act as a constant resistance for measurement. Signup and view all the answers

Why is it important to record the readings carefully during the experiment?

To ensure accuracy in calculating resistance values. Signup and view all the answers

How would you calculate the minimum operating voltage for the fluorescent light in the provided circuit setup?

To calculate the minimum operating voltage, you would vary the output voltage until the fluorescent light turns on and remains stable. Signup and view all the answers

What method can be used to determine the current drawn by the fluorescent light during the experiment?

The current drawn can be measured using an ammeter connected in series with the fluorescent light circuit. Signup and view all the answers

In the context of the experiment, how can you calculate the power consumed by the fluorescent light?

Power can be calculated using the formula $P = VI$, where $V$ is the voltage across the light and $I$ is the current flowing through it. Signup and view all the answers

What role does the power factor play in examining the fluorescent light's efficiency?

The power factor indicates the efficiency of the fluorescent light, measuring the ratio of real power consumed to apparent power. Signup and view all the answers

Describe how to measure the output voltage across the fluorescent light during the experiment.

Measure the output voltage using a voltmeter connected across the terminals of the fluorescent light. Signup and view all the answers

What precautions should you take while measuring the current and voltage in the circuit?

Ensure all connections are secure and avoid touching live wires to prevent electrical shock. Signup and view all the answers

How does the configuration of the circuit affect the readings of current and voltage?

The configuration can change the voltage drop across components and the total circuit resistance, affecting current readings. Signup and view all the answers

Explain the significance of taking multiple readings during the experiment.

Taking multiple readings helps to average out inconsistencies and provides a more reliable set of data. Signup and view all the answers

How can the minimum operating voltage of the circuit be determined during the experiment?

The minimum operating voltage can be determined by gradually increasing the voltage using the potentiometer until the current stabilizes. Signup and view all the answers

What is meant by the current drawn in the context of the experiment, and how is it measured?

The current drawn refers to the amount of electric charge flowing through the circuit, measured with the analog meter. Signup and view all the answers

Explain how to calculate the power consumed by the fluorescent light during the experiment.

Power consumed can be calculated using the formula $P = V imes I$, where V is the voltage and I is the current. Signup and view all the answers

What role does the power factor play in evaluating the performance of the fluorescent light?

The power factor indicates the efficiency of the light, calculated as the ratio of real power to apparent power. Signup and view all the answers

Describe how changing the resistance in the circuit impacts the current drawn.

Increasing resistance will result in a decrease in current according to Ohm's Law, $I = V/R$. Signup and view all the answers

What is the significance of the resonant frequency in an AC circuit?

The resonant frequency is the frequency at which the impedance of the circuit is minimized, resulting in maximum current flow. Signup and view all the answers

How does temperature affect the resistance of the wire wound resistor used in the experiment?

Temperature increases generally lead to higher resistance in conductors, affecting current flow. Signup and view all the answers

What observations would indicate a deviation from Ohm's Law during the experiment?

Non-linear current-voltage results on a graph would indicate a deviation from Ohm's Law. Signup and view all the answers

How is the quality factor (Q) defined in the context of a tuned circuit?

The quality factor (Q) is defined as the ratio of the resonant frequency to the bandwidth of the circuit, mathematically expressed as $Q = \frac{f_r}{\Delta f}$. Signup and view all the answers

In the context of the experiment, why is it important to measure both voltage and current accurately?

Accurate measurements of voltage and current are essential for calculating resistance and verifying Ohm's Law. Signup and view all the answers

What happens to the current in the circuit when the frequency exceeds the resonant frequency?

When the frequency exceeds the resonant frequency, the current starts to decrease. Signup and view all the answers

What components are typically involved in a tuned circuit?

A tuned circuit typically involves an inductor (L), a resistor (R), and a capacitor (C). Signup and view all the answers

What is the formula for calculating the resonant frequency of a tuned circuit?

The resonant frequency is calculated using the formula $f_r = \frac{1}{2\pi \sqrt{LC}}$. Signup and view all the answers

Why is it necessary to measure the minimum operating voltage during the experiment?

Measuring the minimum operating voltage helps ensure that the circuit operates efficiently and within safe limits. Signup and view all the answers

What is the purpose of the sine wave oscillator in the experimental setup?

The sine wave oscillator provides a variable frequency signal necessary for observing the resonance effect in the circuit. Signup and view all the answers

How does the current drawn by the circuit vary with frequency around the resonant frequency?

The current drawn by the circuit increases as the frequency approaches the resonant frequency and decreases beyond it. Signup and view all the answers

Study Notes

Ohm's Law Experiment

Objective: Verify Ohm's Law using graphical results.
Apparatus: Two analog meters (for voltage and current), potentiometer, 10Ω wire wound resistor.

Theory and Formula

Ohm's Law: Under constant temperature, pressure, and humidity, current is directly proportional to voltage across a conductor.
Formula: V = IR (where V is voltage, I is current, and R is resistance)

Experimental Procedure

Connect the 10Ω resistor.
Turn the piano switch on.
Vary the voltage (using the potentiometer) and record corresponding current and voltage values.
Calculate resistance (R = V/I) for different voltage and current readings.
Compare observed and calculated resistance values.
Plot a graph of voltage (V) vs. current (I).

Limitations of Ohm's Law

Non-linear circuits: Ohm's Law does not apply to them.
Uni-lateral circuits: Ohm's Law does not apply to them.

Observations and Calculations

Record voltage (V) and current (I) measurements.
Calculate resistance (R) for each data point using the formula.

Results

Ohm's Law verified. (A straight-line graph supports this)

Conclusions

A straight line graph demonstrates the linear relationship, proving Ohm's Law.

Viva Voce Questions

Ohm's Law Definition: Current is directly proportional to voltage under constant conditions.
Limitations: Non-linear and uni-lateral circuits.
EMF vs. Potential Difference: EMF is the potential difference in an un-connected circuit, while Potential Difference is measured across.
Units: Voltage (Volts), Current (Amps), Resistance (Ohms).
Linear vs. Non-Linear Circuits: Linear circuits have a constant resistance; non-linear circuits don't.
Uni-lateral vs. Bi-lateral Circuits: Uni-lateral circuits only allow current to flow in one direction; bi-lateral circuits allow current in both directions.
Ammeter and Voltmeter Connection: Ammeters are connected in series; voltmeters are connected in parallel.
Rheostat Material: Typically a wire-wound resistor.
Temperature and Resistance: Temperature usually increases resistance.

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Description

This quiz tests your knowledge of the Ohm's Law experiment, focusing on the theoretical foundation and practical procedures. You will explore the relationships between voltage, current, and resistance while identifying the limitations of Ohm's Law. Be ready to apply the formula V = IR and analyze experimental data.