Electric Current and Resistance Quiz

What is the SI unit of electric current?

What is the relationship between the instantaneous current and the net charge flowing across a section of a conductor in a small time interval?

What does the direction of conventional current in an electric circuit represent?

Which of the following statements is true about electric current?

A steady current of 10 mA flows through a conductor. How many electrons pass a given point in the conductor in 1 minute?

A conductor has a length of 10 cm and a cross-sectional area of 2 cm². If its resistance is 5 ohms, what is the resistivity of the material?

Two wires, A and B, are made of the same material. Wire A has twice the length and half the cross-sectional area of wire B. What is the ratio of the resistance of wire A to wire B?

A conductor has a resistance of 10 ohms. What is the potential difference across the conductor if the current through it is 2 amperes?

Which of the following factors does NOT affect the resistivity of a conductor?

A current of 5 amperes flows through a conductor of cross-sectional area 10 cm². What is the current density in the conductor?

What is the relationship between current and charge flow through a conductor?

Which statement accurately describes the direction of conventional current flow?

Which of these scenarios results in zero net electric current within a solid conductor?

What are the current carriers responsible for electrical conductivity in electrolytic solutions?

According to Ohm's law, what is the relationship between potential difference (V), current (I), and resistance (R) in a conductor?

If the free electron density of a conductor is doubled, what happens to the conductivity of the conductor?

Which of the following is NOT a characteristic of an ideal conductor?

What is the primary factor responsible for the existence of free charged particles in the upper atmosphere?

What is the relationship between the relaxation time of electrons and the conductivity of a metal?

In the equation $j = \sigma E$, what does the term $j$ represent?

Which of the following accurately describes the drift of electrons?

What is the relationship between the conductivity of a conductor and its resistivity?

What does Ohm's law state in terms of current density and conductivity?

If the relaxation time of electrons in a metal doubles, what happens to the conductivity of the metal?

What is the approximate average velocity of free electrons in a metal at room temperature?

How is the drift velocity of electrons in a conductor related to the electric field strength?

Which of the following is TRUE about the relationship between the resistance of a conductor and its dimensions?

What is the key difference between resistance and resistivity?

Imagine you have a conductor with constant cross-sectional area. If you double the length of the conductor, what happens to its resistance?

Which of the following is a reason why the resistance of a conductor might increase with temperature?

A circuit contains two resistors connected in series: a 10 Ω resistor and a 20 Ω resistor. What is the equivalent resistance of this series combination?

What is the primary factor responsible for the change in a conductor's resistance with temperature?

A resistor and a conductor made of the same material are connected in series. Which has the higher resistivity?

A conductor has a resistance of 10 ohms. If its length doubles and its cross-sectional area is halved, what is the new resistance?

Which of the following scenarios could be applied to a wire made of a material with a high resistivity?

Which of these statements correctly describes the relationship between current and drift velocity?

A copper wire and a nichrome wire of the same dimensions are connected in series to a battery. Which wire will have a higher temperature rise?

A semiconductor material is unique because its resistivity...

Imagine two identical wires made of the same material but one is twice as long as the other. How do their resistances compare?

Which devices are classified as non-ohmic?

What happens to the resistivity of semiconductors when temperature increases?

Which of the following arrangements correctly reflects the resistivity order of materials?

Which statement about the applicability of Ohm's law is true?

What is the primary characteristic of ohmic devices?

If the electric field inside a conductor is doubled, what happens to the drift velocity of electrons?

At a higher temperature, the relaxation time of electrons in a metallic conductor typically:

What is the relationship between the electron mobility ($\mu$) and the relaxation time ($\tau$)?

Which of the following statements is true about the mobility of charge carriers?

Which of these pairs of materials has a resistivity that decreases with increasing temperature?

How does the resistivity of nichrome change with temperature?

What is the expression for the variation of resistivity of a conductor with temperature?

What is the behavior of the resistivity of a semiconductor as temperature increases?

Which of the following characteristics is NOT suitable for a fuse wire?

What is a key characteristic of heating elements?

What characteristic of manganin and constantan makes them suitable for wire wound standard resistors?

Which formula correctly describes the relationship between electrical energy and power?

In terms of electrical power, how can it be expressed using current and resistance?

What happens to the power dissipated in a resistor as the current increases?

Why is electrical power transmitted at high voltage and low current over long distances?

How is heat generated in a resistor related to the electrical energy being converted?

What does the expression for heat developed in a resistor, caused by electric current, imply?

Which statement is true regarding electrical energy and electrical power?