What is the behavior of current in a series circuit?
A Varies
B Divided
C Constant
D Equal
In a series circuit, the current is the same through all components, as there is only one path for the current to flow. The current remains constant regardless of the number of components.
How does the total resistance in a series circuit change when resistors are added?
A Increases
B Varies
C Decreases
D Stays
In a series circuit, the total resistance increases as more resistors are added. The total resistance is the sum of the individual resistances, resulting in a higher resistance and reduced current.
In a parallel circuit, what happens to the total current?
A Increases
B Divides
C Decreases
D Stays
In a parallel circuit, the total current divides between the branches based on their resistance. Lower resistance branches carry more current, while higher resistance branches carry less current.
What does a capacitor do in an electrical circuit?
A Control current
B Boost voltage
C Resist flow
D Store energy
A capacitor stores energy in the form of an electric field. It accumulates charge on its plates and releases energy when needed, smoothing out voltage fluctuations or filtering signals.
What is the behavior of voltage in a parallel circuit?
A Increases
B Varies
C Stays
D Divides
In a parallel circuit, the voltage across each branch is the same and equal to the source voltage. The voltage does not divide as it does in a series circuit.
What is the effect of adding a resistor in parallel?
A Increases current
B Decreases resistance
C Increases resistance
D Decreases current
Adding a resistor in parallel decreases the total resistance of the circuit. The more parallel branches added, the lower the overall resistance, allowing more current to flow.
What does an inductor oppose in a circuit?
A Current
B Voltage
C Resistance
D Power
An inductor opposes changes in current due to its ability to store energy in a magnetic field. This property makes inductors useful for controlling current fluctuations in AC circuits.
What happens to current when a resistor is added in series?
A Divides
B Stays
C Decreases
D Increases
Adding a resistor in series increases the total resistance of the circuit. According to Ohm’s law (V = I * R), this increase in resistance results in a decrease in current.
What does the term “reactance” refer to in an AC circuit?
A Power loss
B Voltage drop
C Opposition to current
D Resistance
Reactance refers to the opposition that capacitors and inductors provide to the flow of alternating current. It is a combination of inductive reactance and capacitive reactance, affecting the phase relationship between current and voltage.
What is the main function of a transformer?
A Change voltage
B Control resistance
C Store energy
D Change current
A transformer changes the voltage in an AC circuit, either stepping it up or stepping it down. This is done by transferring energy through electromagnetic induction between two coils with different turns ratios.
How is total current determined in a parallel circuit?
A Min current
B Average current
C Sum of currents
D Max current
In a parallel circuit, the total current is the sum of the currents flowing through each branch. The current divides between branches, but the total current increases as more branches are added.
What is the power factor in an AC circuit?
A Impedance ratio
B Ratio of power
C Current flow
D Voltage drop
The power factor is the ratio of real power to apparent power in an AC circuit. It indicates how efficiently the circuit uses power, with a power factor of 1 meaning maximum efficiency.
What does an electrical filter remove?
A Noise
B Power
C Voltage
D Current
An electrical filter removes unwanted frequencies or noise from a signal. It allows certain frequencies to pass through while blocking others, ensuring clean and stable signals in circuits.
What does the resonance condition in a circuit occur at?
A Minimum voltage
B Zero current
C Equal reactance
D Maximum impedance
Resonance occurs in circuits with both inductance and capacitance when the inductive reactance equals the capacitive reactance. This results in the circuit having minimal total reactance, allowing maximum current flow.
What happens to the total impedance in a series R-L circuit when frequency increases?
A Decreases
B Stays
C Divides
D Increases
In a series R-L circuit, the total impedance increases with frequency because the inductive reactance increases with the rise in frequency. This results in a higher total opposition to current flow.