What are passive components in an electrical circuit?
A Resistors
B Capacitors
C Inductors
D All of the above
Passive components, such as resistors, capacitors, and inductors, do not require an external power source to operate. They primarily store, dissipate, or resist electrical energy without amplifying or generating power.
What is the main function of an active component in a circuit?
A Power amplification
B Energy storage
C Energy dissipation
D Voltage regulation
Active components, such as transistors and operational amplifiers, are capable of power amplification. They require an external power supply to function and can amplify electrical signals or control the flow of current in a circuit.
What is feedback in an electrical circuit?
A Energy storage
B Signal modification
C Energy dissipation
D Signal inversion
Feedback in a circuit refers to the process of taking a portion of the output signal and returning it to the input. This can modify or control the behavior of the circuit, especially in amplifiers and control systems.
How do passive components affect the flow of current in a circuit?
A Store energy
B Increase current
C Decrease current
D Block current
Passive components such as resistors, capacitors, and inductors decrease current by offering resistance, storing energy, or opposing changes in current. They help control the amount of current flowing through different parts of the circuit.
What happens when a feedback loop is positive in a circuit?
A Amplifies output
B Stabilizes output
C Decreases efficiency
D Reduces current
Positive feedback amplifies the output signal in a circuit. It occurs when a portion of the output is fed back to the input in phase, causing the system to increase the magnitude of the output signal.
Which of the following is an example of a passive component?
A Diode
B Capacitor
C Transistor
D Op-amp
A capacitor is a passive component, meaning it stores electrical energy in the form of an electric field. It does not require an external power source to operate and is used to store or release energy in circuits.
What is the effect of negative feedback in a circuit?
A Increases gain
B Amplifies noise
C Stabilizes output
D Decreases efficiency
Negative feedback reduces the overall gain in a circuit but stabilizes the output by reducing distortions or noise. It helps improve the performance of amplifiers and control systems by making the system more stable.
What type of component is a transistor?
A Passive
B Energy storage
C Energy dissipation
D Active
A transistor is an active component. It requires an external power supply to function and is used for amplifying signals or switching applications. It controls current flow and can increase the strength of signals in electronic circuits.
Which of the following components requires an external power source to operate?
A Transistor
B Resistor
C Capacitor
D Inductor
A transistor is an active component and requires an external power source to function. It is used to amplify signals or switch electrical signals in circuits, making it essential in modern electronics and communication systems.
How does a resistor affect current flow in a circuit?
A Divides current
B Decreases current
C Increases current
D No effect
A resistor limits the flow of current by offering resistance. According to Ohm’s law, as resistance increases, the current flowing through the circuit decreases, which helps in controlling and managing the circuit’s current.
What type of feedback occurs when the output is fed back in phase with the input?
A Negative feedback
B Open loop
C Positive feedback
D Feedback inversion
Positive feedback occurs when the output is fed back in phase with the input. This can increase the gain or amplification of the signal, making it useful in applications such as oscillators and signal amplification.
Which of these components is most commonly used in amplifiers?
A Transistor
B Capacitor
C Resistor
D Diode
Transistors are commonly used in amplifiers to amplify weak electrical signals. They can increase the strength of an electrical signal and are crucial in audio, radio, and television signal processing circuits.
In which circuit configuration is feedback commonly used to stabilize output?
A Series circuit
B Amplifier circuit
C Voltage divider
D Parallel circuit
Feedback is commonly used in amplifier circuits to stabilize the output. By feeding back a portion of the output to the input, the system can maintain a consistent output despite changes in input conditions.
What is the main function of an op-amp in a circuit?
A Voltage control
B Current flow regulation
C Signal amplification
D Power regulation
An operational amplifier (op-amp) is primarily used to amplify weak electrical signals. It is a key component in signal processing, amplifying the input signal to a level that can be used in other stages of the circuit.
What role do inductors play in electric circuits?
A Store current
B Resist current
C Block current
D Store energy
Inductors store energy in the form of a magnetic field when current passes through them. They resist sudden changes in current and release the stored energy when needed, which is useful for smoothing power supplies and filtering signals.