NEET Physics Alternating Current : Multiple Choice Previous Years Questions MCQs 1

TL;DR

Calculating the resistance of a bulb in an alternating current circuit and solving problems related to power factor, energy consumption, and power loss.

Transcript

hello friends this video on meet in alternating current is brought to you by example calm doe will feel from exam and 500 100 volts is to be used in a 230 volt main supply when a resistance is connected in series it works perfectly and the berth consumes 500 watts the value of R is okay so let us first understand the circuit so you basically have a... Read More

Key Insights

• ✊ Calculating the resistance of a bulb in an alternating current circuit requires knowledge of power and voltage.
• ✊ Power factor in an LCR circuit can be determined using the relationship between inductive and capacitive reactance.
• 🥺 In a capacitive circuit, the current leads the voltage by 90 degrees.
• ✊ Power loss in a circuit with an inductor, capacitor, and resistor in series can be calculated using the power formula and impedance.

Questions & Answers

Q: How do you calculate the resistance of a bulb in an alternating current circuit?

To calculate the resistance of a bulb, we use the formula power is equal to voltage squared divided by resistance. By substituting the given power and voltage values, we can calculate the resistance.

Q: How do you calculate the power factor in an LCR circuit?

The power factor in an LCR circuit can be calculated using the expression tan(Φ) = (XL - XC) / R, where XL is the inductive reactance, XC is the capacitive reactance, and R is the resistance. By rearranging the equation, we can find cos(Φ), which gives us the power factor.

Q: What is the phase relationship between current and voltage in a capacitive circuit?

In a capacitive circuit, the current leads the voltage by 90 degrees.

Q: How do you calculate the power loss in a circuit with an inductor, capacitor, and resistor in series?

The power loss in the circuit can be calculated using the formula P = (V^2 * R) / (Z^2), where V is the voltage, R is the resistance, and Z is the impedance of the circuit.

Summary & Key Takeaways

• The video discusses how to calculate the resistance of a bulb in an alternating current circuit using the power and voltage values.

• It explains how to calculate the power factor in an LCR circuit using the relationship between inductive and capacitive reactance.

• It demonstrates that in a capacitive circuit, the current leads the voltage by 90 degrees.

• It presents a problem involving an LCR circuit and asks for the power loss in the circuit.