Question Bank: CURRENT ELECTRICITY

What constitutes electric current?

What is the SI unit of electric current?

Which of the following is an example of steady current?

What happens to the direction of current when negative charges flow towards a given point?

What measures the net flow of charge across an area per unit time?

In which material do electrons primarily contribute to electric current?

What role does thermal motion play in the flow of current?

Which of the following currents is considered to be the highest in magnitude?

How is a current of 1 ampere defined?

Which of the following best describes charge flow in conductors?

How is electric current related to the movement of charged particles?

What effect does an electric field have on free electrons in a conductor?

In the equation I = lim (DQ/Δt) as Δt tends to zero, what does I represent?

What is the primary charge carrier in metallic conductors?

What is the SI unit of electric current?

According to Ohm's Law, if the current increases, what happens to potential difference, assuming resistance is constant?

When no electric field is applied to a conductor, what is the net current observed?

Which of the following correctly describes the flow of current in metallic conductors?

What is the SI unit of electric current?

What happens to the resistance of a conductor if its length is doubled, assuming the cross-sectional area remains the same?

According to Ohm's Law, how is the current (I) related to voltage (V) and resistance (R)?

How does temperature typically affect the resistance of a conductor?

If the resistance of a wire is doubled while maintaining the same voltage, what happens to the current?

In which of the following scenarios would a steady current be established in a conductor?

What is the relationship between current density (j) and current (I) through a conductor of cross-sectional area (A)?

What is the effect of increasing the cross-sectional area of a conductor on its resistance?

What happens to the resistance of a wire if its length is tripled?

What type of materials allow electric current to pass freely?

What is the total current at a junction where 3 A, 2 A, and 5 A currents meet?

Why do electrolytic solutions conduct electricity?

If an electric circuit has a total resistance of 12 ohms and is powered by a 24-volt battery, what is the current flowing through the circuit?

What is Ohm's law used to define?

In a parallel circuit, if one branch has a resistance of 4 ohms and another branch has a resistance of 6 ohms, what is the equivalent resistance?

In a conductor, as the drift velocity of electrons increases due to an applied electric field, what happens to the current?

What determines the direction of conventional current flow in a circuit?

If a conductor has a resistance of 5 Ohms and a current of 2 Amperes flows through it, what is the potential difference across the conductor?

When an electric field is established in a conductor, how do the free electrons behave?

How does the voltage across a resistor relate to the current flowing through it according to Ohm's Law?

Which physical quantity is inversely proportional to resistance?

When the temperature of a conductor increases, what typically happens to its resistance?

A Wheatstone bridge is used to measure resistance. When the bridge is balanced, what is true about the resistances?

What is the principle behind Kirchhoff's Loop Rule?

If a conductor has a resistivity of 1.6 × 10^-8 Ω·m and its length is doubled while its cross-sectional area remains constant, what happens to its resistance?

In a circuit powered by a 10V battery with a total resistance of 5Ω, what is the power consumed by the circuit?

What does Ohm's Law state?

If the voltage across a resistor is doubled, what happens to the current through the resistor within the limit of Ohm's Law?

What happens to the resistance if the voltage across the circuit increases and the current remains constant?

A 10 Ohm resistor carries a current of 2 Amps. What is the voltage across the resistor?

If two resistors, 4 Ohm and 6 Ohm, are connected in series, what is the total resistance?

Which of the following units is used to measure resistance?

What is the power dissipated in a resistor given by the equation P = I^2R? If I is halved, what happens to P?

If a material's resistance is constant, it is classified as which type of conductor according to Ohm's Law?

What can be inferred about a non-ohmic resistor when the voltage increases?

What is the equivalent resistance when a 3 Ohm and a 6 Ohm resistor are connected in parallel?

Electric current is best described as:

In a circuit with a constant voltage, if the resistance increases, what occurs to the current?

Which of the following correctly describes the internal resistance of a cell?

When a conductor is heated, how does this typically affect its resistance?

What is the drift velocity of electrons in a conductor when subjected to an electric field?

In the presence of an electric field, how does the acceleration of an electron relate to its mass?

What causes a change in the resistivity of a conductor?

Which of the following statements is true regarding the drift velocity of electrons?

What is the relationship between current density (j) and electric field (E) in a conductor?

What occurs to an electron's direction of motion after it collides with a fixed ion in a conductor?

When discussing conductivity, which relationship is accurate?

What is the effect of increasing the temperature of a conductor on its resistivity?

In a metallic conductor, the majority charge carriers are:

Which of the following correctly describes Ohm's law in vector form?

What is the average drift velocity of electrons in a conductor with an electric field applied?

In the equation F = ma, what does 'F' represent in the context of electron movement?

How does drift velocity contribute to electric current?

In a conductor at steady state, the flow of electrons is primarily affected by which factor?

What is the most important factor influencing the resistivity of a material?

Which of the following statements best describes a limitation of Ohm's Law?

In which situation does Ohm's law typically fail?

What happens to the voltage across a diode when the current is reversed?

Which of the following materials predominantly obeys Ohm's law?

In certain materials, the voltage does not remain proportional to the current. This is an example of:

Which of the following describes a situation where multiple values of voltage correspond to a single value of current?

What is one characteristic of semiconductors that violates Ohm's Law?

Why do metals typically obey Ohm's Law at room temperature?

For which of the following devices is the I-V characteristic nonlinear?

In a material showing a negative temperature coefficient of resistance, what happens to the resistivity with increasing temperature?

What kind of behavior do superconductors exhibit related to Ohm's Law?

When considering the limitations of Ohm's Law, which of the following is NOT a factor?

How does a thermistor typically behave under varying temperatures?

Why is it important to recognize the limitations of Ohm’s Law in practical applications?

What is the formula for electrical power in terms of current and voltage?

If the current flowing through a resistor is doubled, how does the power dissipated in the resistor change?

What is the main source of power that keeps a steady current flowing through a circuit?

What happens to the energy dissipation in a conductor if its resistance is halved while keeping current constant?

If the voltage across a device is 12V and it carries a current of 2A, what is the power consumed by the device?

What is the expression for power loss in a resistor based on Ohm's law?

Which of the following reduces power loss in electrical transmission?

In a circuit where a battery provides 9V and a bulb draws 1.5A, how much energy is dissipated in 10 seconds?

If the total resistance in a circuit is 10 Ohms and the current is 5 Amps, what is the voltage across the circuit?

In which scenario would you expect the least power loss in a conductor?

If a circuit experiences an increase in resistance without any change in voltage, what happens to the current?

If a human body has a resistance of about 1000 Ohms, how much current can pass through it when connected to a 230V supply?

Which factor does NOT affect the power dissipation in resistive heaters?

Which formula expresses the relationship between resistance, voltage, and power?

When considering electrical energy loss during transmission, what primarily influences thermal loss?

What is the effect of temperature on the resistivity of metals?

Which equation represents the temperature dependence of resistivity in a metallic conductor?

What is the typical behavior of semiconductors with regard to resistivity and temperature?

In the context of resistivity, what does the symbol 'α' represent?

Which of the following materials generally has the highest resistivity?

How does the value of 'n' in the resistivity formula relate to temperature in metals?

If the temperature coefficient of resistivity for nichrome is 1.70 × 10⁻⁴ °C⁻¹, what does this imply?

Which material is commonly used for wire-bound standard resistors due to its stable resistivity with temperature changes?

How does temperature affect the average time between collisions (τ) in conductors?

Which of the following graphs would best represent the temperature dependence of resistivity for metals over a limited range of temperatures?

If the resistivity of a material was plotted against temperature, what pattern would you expect for semiconductors?

In which condition would a metallic conductor deviate from the linear resistivity-temperature relationship?

Considering the equation for the resistivity of a semiconductor, what would happen to its resistivity if 'n' increases significantly with temperature?

What is the function of the positive electrode in an electrolytic cell?

What does EMF stand for in the context of electric cells?

Which of the following factors primarily affects the internal resistance of a cell?

In an ideal cell, what is the internal resistance?

If a cell produces an EMF of 12V and has an internal resistance of 2 ohms, what is the terminal voltage when a load of 4 ohms is connected?

What happens to the EMF of a cell as its internal resistance increases?

Which type of cell is typically characterized by high internal resistance?

What is the unit of measurement for EMF in a circuit?

What is the effect of temperature on the internal resistance of a conductor?

Which of the following describes the relationship between EMF (E), terminal voltage (V), internal resistance (r), and current (I)?

When current flows through the internal resistance of a cell, what phenomenon occurs?

How does connecting multiple cells in series affect the total EMF?

Which characteristic distinguishes a secondary cell from a primary cell?

What happens to the total emf when two identical cells are connected in series?

In a circuit, if a cell with an EMF of 9V and an internal resistance of 3 ohms powers a load of 3 ohms, what is the power dissipated in the load?

In a series connection of two cells, if the internal resistances are equal, how does it affect the total internal resistance?

Which equation is used to determine the efficiency of a cell?

When cells are connected in parallel, how does the total emf compare to the emf of the individual cells?

If three cells of emfs \( e_1, e_2, e_3 \) are connected in parallel, what is the equivalent emf?

What is the total current in a circuit with a 12V battery and a total resistance of 4Ω?

What is the effect on total resistance when cells with differing internal resistances are connected in parallel?

Given two cells with emf values of 5V and 10V connected in series, what is the total emf?

If one cell in a series connection becomes defective, what happens to the circuit?

When two cells with emf values of 6V and 9V are connected in parallel, what will be the net output voltage?

What is the formula for equivalent internal resistance \( r_{eq} \) when two internal resistances \( r_1 \) and \( r_2 \) are in series?

In a series circuit, if the current through two identical cells is 2 A, what is the current flowing in the circuit?

Which of the following statements regarding parallel cells is true?

If two cells with emfs of 1.5V and 3V are connected in opposite polarity in series, what is the equivalent emf?

For cells connected in parallel with different internal resistances, what occurs regarding current?

What is the overall effect on voltage when three cells in series with internal resistances connected to a load are used?

What is the main purpose of a Wheatstone bridge?

In a balanced Wheatstone bridge, what is the current through the galvanometer?

What is the condition for balance in a Wheatstone bridge?

Which of the following configurations represents a Wheatstone bridge?

If one of the resistances in a Wheatstone bridge is unknown, how can it be determined?

What happens to the galvanometer reading when the Wheatstone bridge is unbalanced?

Which of the following is a practical application of the Wheatstone bridge?

Which principle is used to analyze the Wheatstone bridge?

Calculate the unknown resistance \( R_4 \) if \( R_1 = 10 \Omega, R_2 = 20 \Omega, R_3 = 30 \Omega \).

What is a common misconception regarding the Wheatstone bridge?

In an experiment using a Wheatstone bridge, if the ratio \( R_1/R_2 \) is 2, what ratio must \( R_3/R_4 \) have for the bridge to balance?

If a galvanometer shows a deflection while using a Wheatstone bridge, what does that indicate?

What kind of current is specified when dealing with the Wheatstone bridge?

In the formula \( R_4 = (R_1 R_3) / R_2 \), what does \( R_4 \) represent?

What does Kirchhoff's Junction Rule state about currents at a junction?

Which of the following is true according to Kirchhoff's Loop Rule?

In a series circuit with three resistors, how is the total resistance calculated?

What is the effect of adding resistors in series to a circuit?

In a parallel circuit, how do you determine the total current?

Kirchhoff's Junction Rule is based on which of the following principles?

When applying Kirchhoff's Loop Rule, if you traverse a resistor in the same direction as the current, what is the sign of the potential change?

In a closed loop, a power source with an EMF of 12V and resistors with a total resistance of 4Ω are connected. What is the current flowing through the circuit?

What happens to the total resistance if a resistor is added in parallel to an existing circuit?

In which scenario would Kirchhoff's rules be essential for circuit analysis?

Consider a circuit with two branches. If branch one has a current of 5 A entering a junction and branch two has a current of 3 A leaving the junction, what is the current in the third branch?

In a Wheatstone bridge, what is the condition for equilibrium?

How can Kirchhoff's second rule provide insights into voltage in series circuits?

If a circuit consists of a battery and three resistors in series and the total voltage provided by the battery is 9V, how much voltage will drop across each resistor if they are of equal resistance?

Which of the following materials has the lowest resistivity?

What is the resistivity range for metals?

Which material is classified as an insulator?

What effect does temperature generally have on the resistivity of metals?

What is the significance of the temperature coefficient of resistivity?

Which of the following is true for semiconductors?

What happens to the resistivity of a semiconductor when impurities are added?

Which material is used to make standard resistors due to its low temperature dependence of resistivity?

If the resistivity of a metallic conductor is given as 1.7 × 10^-8 Ωm, what feature of the conductor does this indicate?

How does the resistivity of nichrome change with temperature?

What is the typical resistivity of insulators like rubber or ceramic?

Which equation represents the temperature dependence of resistivity for metals?

What impact does increasing temperature have on the resistivity of typical semiconductor materials?

Which of the following materials would exhibit a unique voltage-current relationship?

Which of the following best describes the relationship between temperature and resistivity in materials like nichrome?

What is the primary reason alloys like constantan are used for standard resistors?