Question 1

Electric Current in a conductor

Accepted Answer

is All the possible answers listed

Answer

is the amount of charge that passes through a cross sectional area in a given time

Answer

is $i=\frac{dq}{dt}$

Answer

is measured in amperes or coulomb's per second

Question 2

Current is related to current density in that

Accepted Answer

$i = \int JdA$

Answer

$i = \int JdV$

Answer

none of these choices

Answer

$i = \int \frac{J}{A}dA$

Question 3

Resistance of a conductor is given by measuring the voltage across the conductor and current that passes through it.  It is best described with

Accepted Answer

$R = \frac{V}{i}$

Answer

$R = \frac{i}{V}$

Answer

$R = iV$

Answer

$R = i^2V$

Question 4

Resistivity  is a property of a _______ and is measured in ______.

Accepted Answer

material, $\Omega m$

Answer

object, $\Omega $

Answer

object, $\Omega m$

Answer

material, $\Omega $

Question 5

To calculate resistivity of an object knowing, the Resistance, the length and cross sectional area, you would use

Accepted Answer

$\rho=\frac{RA}{L}$

Answer

$\rho=\frac{A}{L}$

Answer

$\rho=\frac{RA}{L^2}$

Answer

$\rho=\frac{RL}{A}$

Question 6

Resistance is a property of an object.  To find resistance of an object knowing, the resistivity, length and cross sectional area use

Accepted Answer

$R=\rho \frac{L}{A}$

Answer

$R=\rho \frac{A}{L}$

Answer

$R=\rho \frac{L^2}{A}$

Answer

$R=\frac{L}{\rho A}$

Question 7

Which of the following materials would have a large value for resistivity

Accepted Answer

Glass

Answer

Copper

Answer

Aluminium

Answer

Silver

Question 8

Rank the cylindrical copper conductors along with their face areas and lengths.  Rank them according to the current through them, greatest first.

Accepted Answer

A = C > B

Answer

C > A > B

Answer

B > A = C

Answer

A > C > B

Question 9

V = IR is

Accepted Answer

Ohm's Law

Answer

Lenz's Law

Answer

Faraday's Law

Answer

Midzak's Law

Question 10

The rate at which a battery transfer electric energy is

Accepted Answer

$P = iV$

Answer

$P = i^2R$

Answer

$P = \frac{V}{i}$

Answer

$P = \frac{i}{V}$

Question 11

The equations $P=i^2R$ and $P=\frac{V^2}{R}$ can be used to find the following except

Accepted Answer

the total amount of charge that passes through a an object with resistance.

Answer

to find the resistive dissipation

Answer

the transfer of electric potential energy to thermal energy in a device with resistance.

Answer

the rate at which thermal energy is being dissipated

Question 12

A resistor of length L and area A has resistance $R=16 \Omega$. A potential difference of 8V is applied acrossed.   At what rate is energy being dissipated?

Accepted Answer

4 W

Answer

1/4 W

Answer

2 W

Answer

1/2W

Question 13

A wire of length L and cross sectional area of A has resistance $R$.  The wire is melted and then reformed into a wire that is 5L.    What is the new resistance in terms of $R$?

Accepted Answer

$25R$

Answer

$\frac{1}{25}R$

Answer

$5R$

Answer

$\frac{1}{5}R$

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