Electric Current and Conductor Properties

True (A)

positive

<p>electric</p> Signup and view all the answers

<p>Charges in a conductor without an electric field = Random motion Positive charges in a conductor with an electric field = Net displacement in the direction of the electric field Negative charges in a conductor with an electric field = Net displacement opposite to the direction of the electric field</p> Signup and view all the answers

<p>The objects have different resistances. (D)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Zero everywhere (C)</p> Signup and view all the answers

<p>Ohm ($\Omega$)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>random</p> Signup and view all the answers

<p>R</p> Signup and view all the answers

<p>To oppose the flow of current. (B)</p> Signup and view all the answers

<p>zero</p> Signup and view all the answers

<p>Induces a directed flow of charge. (D)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>current</p> Signup and view all the answers

<p>Electrostatic Condition = No net flow of charge No electric field = Random motion Constant electric field = Directed flow of charge</p> Signup and view all the answers

<p>Directly proportional (D)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Type of material, temperature of material</p> Signup and view all the answers

<p>directly</p> Signup and view all the answers

<p>Resistivity increases. (C)</p> Signup and view all the answers

<p>Conductors = Ohm's Law applies under specific conditions. Semiconductors = Ohm's Law only applies under limited circumstances. Superconductors = Ohm's Law is not applicable.</p> Signup and view all the answers

<p>Resistance is doubled. (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Doubling the length and halving the cross-sectional area (D)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>2e-7</p> Signup and view all the answers

<p>length</p> Signup and view all the answers

<p>Increase in Length = Increases Resistance Increase in Cross-sectional Area = Decreases Resistance Increase in Resistivity = Increases Resistance Decrease in Temperature (for some materials) = Decreases Resistance</p> Signup and view all the answers

<p>The electric field increases. (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>4</p> Signup and view all the answers

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<p>Electric Field (E) = $\rho J$ Potential Difference (V) = $EL$ Resistance (R) = $\frac{\rho L}{A}$</p> Signup and view all the answers

<p>Resistance remains the same. (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>2</p> Signup and view all the answers

<p>Decreasing the length and increasing the cross-sectional area. (B)</p> Signup and view all the answers

<p>EL</p> Signup and view all the answers

Average velocity of charged particles in a conductor due to an electric field.

The movement of charges in a conductor without an electric field.

The overall distance a charged particle moves in an electric field.

The flow direction of positive charges in a circuit, indicates current direction.

Establishing an electric field causes orderly motion of charges in a conductor.

The flow of electric charge from one region to another.

E = 0 inside a conductor in electrostatics, meaning no current flows.

Without an electric field, electrons move randomly, resulting in no net flow of charge.

A state where there is no overall movement of charge in any direction.

When a constant electric field is applied inside a conductor, it can initiate current.

The specific routes that charges follow within conductive materials.

The study of charged objects at rest, with E = 0 inside conductors.

Materials that allow the flow of electric charge, creating currents.

Opposition to the flow of electric current in a conductor.

Relationship between voltage (V), current (I), and resistance (R) expressed as V = IR.

A component that resists the flow of current, characterized by a specific resistance value.

The difference in electric potential energy per unit charge between two points in a circuit.

A material property that quantifies how strongly a given material opposes current flow.

R = ρL/A, where ρ is resistivity, L is length, A is area.

The SI unit for resistance is the Ohm (Ω) or Volt per Ampere (V/A).

Resistance depends on resistivity, length, and cross-sectional area of the conductor.

If a conductor has constant resistivity, resistance is solely influenced by its geometry.

Resistivity depends on the type and temperature of the material.

Resistivity does NOT depend on the size and shape of the material.

Materials that have a conductivity between conductors and insulators, often manipulated for technology.

Materials that can conduct electricity with zero resistance at low temperatures.

A wire with a specific resistivity of 1.69 × 10−8 [Ω · m], common in electrical applications.

E = ρJ relates electric field to current density and resistivity.

V = EL defines potential difference in terms of electric field and length.

R = V/I expresses resistance in terms of voltage and current.

A material's intrinsic property that indicates how strongly it resists current flow.

The unit of electric field, E, is volts per meter (V/m).

L in V = EL represents the physical length where the field acts.

The amount of current flowing per unit area, J = I/A.

E has dimensions of V/m, indicating its relation to energy and distance.

The area through which current flows, influencing resistance calculations.