Module 2 - Electrical Fundamentals - Quiz

The expression R2 || R3 indicates that R2 and R3 are connected in parallel. In a parallel connection, the components are connected side by side, allowing the current to split between them. This means that the voltage across R2 and R3 is the same, while the total current flowing through the combination is the sum of the currents flowing through each resistor.

When resistors are connected in parallel, they have the same voltage across them. This is because the voltage across each resistor in a parallel circuit is equal to the total voltage of the circuit. Therefore, the correct answer is "same".

In the given diagram, the resistors R2 and R3 are connected in parallel. This means that both resistors are connected to the same two points in the circuit. In a parallel connection, the voltage across each resistor is the same, while the total current flowing through the resistors is divided between them. Therefore, the correct answer is that R2 and R3 are parallel.

In a series circuit, the current flowing through each component is the same. This is because there is only one path for the current to flow, so it experiences the same resistance throughout the circuit. As a result, the current remains constant throughout the circuit. Therefore, the correct answer is "always same."

A combinational circuit consists of both series and parallel resistors. In a series circuit, the resistors are connected one after the other, creating a single path for the current to flow. In a parallel circuit, the resistors are connected side by side, creating multiple paths for the current to flow. A combinational circuit may have a combination of both series and parallel resistors, allowing for more complex circuit configurations and greater control over the flow of current.

The picture shows a variable resistor because it is a component that can be adjusted to change the resistance in a circuit. This is indicated by the presence of a knob or slider on the resistor, allowing the user to vary the resistance as needed.

In an electric circuit, switches can be connected in series or in parallel. However, the question states that the switches will always be connected in a certain way. Since the answer is "series," it means that the switches will always be connected in series. This means that the switches are connected one after another, forming a single pathway for the electric current to flow through.

A variable resistor is a type of resistor that can be manually adjusted to change its resistance value. Unlike fixed resistors, which have a set resistance value that cannot be changed, variable resistors allow for precise control of resistance by physically adjusting a knob or slider. This makes them useful in applications where the resistance needs to be varied, such as in volume controls or dimmer switches. Therefore, the correct answer is "resistor adjusted manually".

The application of a variable resistor can be seen in all of the mentioned scenarios. In a radio, a variable resistor can be used to control the volume by adjusting the resistance in the audio circuit. In dim lighting, a variable resistor can be used to adjust the brightness by varying the resistance in the lighting circuit. In a voltage variable power supply, a variable resistor can be used to adjust the output voltage by changing the resistance in the circuit. Therefore, all of the mentioned options are correct applications of a variable resistor.

The symbol given here represents a three terminal variable resistor. This type of resistor has three terminals, allowing for more flexibility in its usage compared to a two terminal variable resistor or a fixed resistor. It can be adjusted to vary the resistance between the two outer terminals, making it useful in applications where precise resistance control is required.

The symbol shown in the question represents a two terminal variable resistor. This type of resistor has two terminals that can be adjusted to change the resistance value. It is commonly used in circuits where the resistance needs to be varied, such as in volume controls or dimmer switches. The symbol accurately depicts the two terminals and the variable nature of the resistor.

The centre terminal of a variable resistor is called a slider because it is used to slide along the resistive material, allowing the user to adjust the resistance value. The slider makes contact with the resistive material at different points, effectively changing the length of the resistive path and hence altering the overall resistance of the circuit. This allows for precise control over the amount of resistance in the circuit.

A rheostat is a variable resistor that is used to control the flow of electric current in a circuit. It is designed to handle high power levels, allowing for the regulation of a large amount of electrical energy. This makes it suitable for applications where high power is involved, such as in industrial machinery, lighting systems, or motor control.

The correct answer is "all of the above". In an electric circuit, a node is a point where multiple branches connect or split away. It is a meeting point for currents, as well as a point where currents join or split. Therefore, all of the given options accurately describe a node in an electric circuit.

The potentiometer is used for low power circuits because it is designed to handle small amounts of electrical power. It is commonly used to control voltage or current in electronic devices and can be adjusted to achieve the desired power output. Potentiometers are not suitable for high power circuits as they may not be able to handle the large amounts of electrical energy without getting damaged. Additionally, potentiometers are not necessary in circuits where power is not required, as they are primarily used for power control purposes. Therefore, the correct answer is low power.

The correct answer is "All of the above". This means that all three statements regarding the arrangement of the resistors in the diagram are true. The resistors R1 and R2 are connected in parallel, and R3 is connected in series with the combination of R1 and R2. This implies that the current flowing through R1 and R2 is the same, while the total resistance of the circuit is the sum of R1, R2, and R3.

Tracing the current in an electric circuit allows us to determine the path that the current takes and identify the components that are connected in series or in parallel. By following the flow of current, we can observe where it branches off or combines, indicating parallel or series connections respectively. This method is effective in visually understanding the circuit configuration and identifying the different components.