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WorksheetsPhysics_1_27_Chapter
Total questions: 20
Worksheet time: 10mins
What is the definition of electric current?
The rate at which charge flows through a surface
The amount of flow of charge through a material
The amount of charge per unit time
The average speed at which charges move
What is the direction of conventional current?
The opposite of the direction of electron flow
The direction in which positive charge moves
The direction of electron flow
The direction in which negative charge moves
The relationship between electric current and resistance
Electric current is equal to resistance
Electric current is independent of resistance
Electric current is directly proportional to resistance
Electric current is inversely proportional to resistance
What is the average speed at which charges move called?
Resistance
Electric potential
Drift velocity
Conductance
The flow of charged particles through an electrical conductor or space defined as
Voltage
Electric field
Electric current
Resistance
What is the equation for average current in a conductor?
I( avg )= DQ/Dt
I (avg) = nqvd
I (avg) = nAvdDt
I (avg) = nqvdA
The microscopic model of conduction in a metal
Electric field establishment
Drift speed of electrons
Random motion of charge carriers
Heat transfer
What is the drift speed in a conductor?
The average speed of charge carriers called the drift speed
The parabolic shape of the charge carriers' paths
The speed of charge carriers due to the acceleration by the electric force
The speed of charge carriers in the absence of an electric field
What is the unit of electric current?
Volt
Ampere
Ohm
Coulomb
The definition of current density in a conductor
Current per unit length
Current per unit volume
Current per unit area
Current per unit resistance
What is the equation that defines the resistance of a conductor?
R = dV/I
What is the relationship between the resistance of a cylindrical conductor and its length and cross-sectional area?
Resistance is directly proportional to length and cross-sectional area
Resistance is inversely proportional to length and directly proportional to cross-sectional area
Resistance is inversely proportional to length and cross-sectional area
Resistance is directly proportional to length and inversely proportional to cross-sectional area
unit of resistance
Volt per ampere
Ohm per volt
Ampere per volt
Ohm per meter
What did the Drude model of electrical conduction propose?
The model proposed that a conductor consists of a regular array of atoms and a collection of free electrons
The model proposed that electrons move randomly through the conductor in the absence of an electric field
The model proposed that the energy transferred to the atoms causes the internal energy
he model proposed that the resistivity can be related to the motion of electrons in metals
The relationship between the average current in the conductor and the current density
J = nqE / me
Iavg = nqE / me
I (avg) = nq2E / me
J = nq2E / me
What property of a conductor varies approximately linearly with temperature over a limited range?
Resistivity
Conductivity
What is the expression for the variation of resistivity with temperature?
What happens to the resistivity of a superconductor when the temperature is at or below its critical temperature?
Drops to Zero
What is the expression for the power delivered to a resistor in an electrical circuit?
P = I∆V
What is the misconception associated with the direction of current in an electric circuit?
The misconception that current is only present in the resistor and not in the connecting wires
The misconception that current flows in opposite directions at different points in the circuit
The misconception that current comes out of one terminal of the battery and is then "used up" as it passes through the resistor, leaving current in only one part of the circuit
