Norton’s Theorem simplifies a complex linear circuit into an equivalent current source in parallel with a resistance. This equivalent circuit makes it easier to analyze and solve for current or voltage in the network.
What does the maximum power transfer theorem help achieve?
A Maximum current
B Minimum voltage
C Maximum impedance
D Maximum power delivery
The Maximum Power Transfer Theorem states that maximum power is delivered to the load when the load resistance matches the source resistance. If the load resistance is not matched, power transfer is less efficient.
What does the Superposition Theorem help analyze?
A Complex circuits with multiple sources
B Transient response
C Current sources
D Voltage sources
The Superposition Theorem simplifies the analysis of linear circuits with multiple independent sources by analyzing each source individually and summing the results. This makes it easier to compute current or voltage in the circuit.
Which component in a circuit resists changes in current?
A Diode
B Capacitor
C Inductor
D Resistor
An inductor resists changes in current by storing energy in a magnetic field. When the current changes, the magnetic field also changes, which opposes the current change, making inductors useful in AC circuits for filtering.
What is the main purpose of the Thevenin’s Theorem?
A Simplify circuits
B Divide voltage
C Measure impedance
D Find current
Thevenin’s Theorem simplifies a complex linear circuit into a simpler equivalent circuit with a single voltage source and series resistance. This is particularly useful for analyzing circuits with multiple components connected to a load.
In a parallel circuit, what happens to the total resistance as more resistors are added?
A Increases
B Remains the same
C Decreases
D Becomes zero
In a parallel circuit, the total resistance decreases as more resistors are added. The reciprocal of the total resistance is the sum of the reciprocals of individual resistances, resulting in a lower total resistance.
What is the impedance of a pure resistor in an AC circuit?
A Inductive
B Zero
C Infinite
D Equal to resistance
In an AC circuit, the impedance of a pure resistor is equal to its resistance value. It does not have any phase shift between current and voltage, unlike inductors and capacitors, which cause phase shifts.
What does the term ‘reactance’ refer to?
A Voltage regulation
B Resistance to AC
C Power loss
D Resistance to DC
Reactance is the opposition to the flow of alternating current caused by capacitors and inductors. It is frequency–dependent, unlike resistance, which is constant for both AC and DC circuits.
What happens to the current in a series circuit as more resistors are added?
A Remains constant
B Becomes zero
C Decreases
D Increases
In a series circuit, adding more resistors increases the total resistance. According to Ohm’s Law (V = IR), the total current in the circuit will decrease as the resistance increases, assuming a constant voltage source.
What is the effect of increasing the frequency on the capacitive reactance?
A No effect
B Increases reactance
C Becomes infinite
D Decreases reactance
Capacitive reactance is inversely proportional to the frequency of the AC signal. As the frequency increases, the capacitive reactance decreases, allowing more current to flow through the capacitor at higher frequencies.
What is the primary characteristic of a series RLC circuit at resonance?
A Zero current
B Zero voltage
C Maximum impedance
D Maximum current
At resonance in a series RLC circuit, the inductive and capacitive reactances cancel each other out, resulting in the lowest impedance. This allows maximum current to flow through the circuit at the resonant frequency.
Which of the following components stores energy in an electric field?
A Resistor
B Diode
C Capacitor
D Inductor
A capacitor stores energy in the form of an electric field between its plates. When connected to a power source, it charges up, and when disconnected, it can discharge the stored energy back into the circuit.
What does the phase angle in an AC circuit indicate?
A The time difference between current and voltage
B Current magnitude
C Voltage amplitude
D Impedance value
The phase angle represents the time difference (or phase shift) between the voltage and current in an AC circuit. A phase angle of zero means the voltage and current are in phase with each other.
What does a voltage divider do?
A Decrease power
B Divide voltage
C Divide current
D Increase voltage
A voltage divider splits a voltage into smaller voltages. It is usually made using two resistors in series. The output voltage is proportional to the ratio of the resistors in the circuit.
In an AC circuit, what does the power factor indicate?
A Total resistance
B Phase difference
C Efficiency of power usage
D Total energy used
The power factor in an AC circuit indicates the efficiency with which power is being used. It is the ratio of real power to apparent power, with a value of 1 representing perfect efficiency.