Question 1

An object that is positively charged will

Accepted Answer

A)  attract a rubber rod stroked with fur. 
B)  attract a glass rod stroked with silk. 
C)  be polarized. 
D)  none of these 
A)  attract a rubber rod stroked with fur. 
B)  attract a glass rod stroked with silk. 
C)  be polarized. 
D)  none of these A

Question 2

A component in an automobile 12-V electrical system has a resistance of 90 Ω.How much current is in the component when in operation?

Accepted Answer

A)  100 A 
B)  0.13 A 
C)  7.5 A 
D)  1100 A 
A)  100 A 
B)  0.13 A 
C)  7.5 A 
D)  1100 A B

Question 3

The electrical power dissipated in an appliance depends on

Accepted Answer

A)  voltage. 
B)  current. 
C)  resistance. 
D)  all of these. 
A)  voltage. 
B)  current. 
C)  resistance. 
D)  all of these. D

Question 4

The abbreviation of the unit of resistance is

Accepted Answer

A)  $\Psi$ 
B)  $\Delta$ 
C)  $\Sigma$ 
D)  $\Omega$ 
E)  $\Pi$ 
A)  $\Psi$ 
B)  $\Delta$ 
C)  $\Sigma$ 
D)  $\Omega$ 
E)  $\Pi$

Question 5

A system of a proton and an electron has a net charge of

Accepted Answer

A)  +1.6 × 10-19 C. 
B)  -1.6 × 10-19 C. 
C)  3.2 × 10-19 C. 
D)  zero. 
A)  +1.6 × 10-19 C. 
B)  -1.6 × 10-19 C. 
C)  3.2 × 10-19 C. 
D)  zero.

Question 6

A 10-Ω resistor and a 20-Ω resistor are connected in parallel,and this combination is connected in series to a 30-Ω resistor.If the arrangement is hooked to a 12-V battery,how much current flows in the circuit?

Accepted Answer

The answer of A 10-Ω resistor and a 20-Ω resistor...

Question 7

Voltage has the units of ______________,which is called a volt.

Accepted Answer

joules per

Question 8

Ohm's law gives the relationship between

Accepted Answer

A)  current and voltage. 
B)  work and current. 
C)  current and charge. 
D)  force and current. 
A)  current and voltage. 
B)  work and current. 
C)  current and charge. 
D)  force and current.

Question 9

A steady current of 0.15 A exists in a wire for 20 s.
a. How much net charge passes by a point in the wire?
b. How many electrons does this charge represent?

Accepted Answer

a.3.0 C
b.

Question 10

A ferromagnetic material is magnetized by the alignment of

Accepted Answer

A)  domains. 
B)  atoms. 
C)  single magnetic dipoles. 
D)  poles. 
A)  domains. 
B)  atoms. 
C)  single magnetic dipoles. 
D)  poles.

Question 11

The electrical power dissipated by a resistance R is

Accepted Answer

A)  inversely proportional to I. 
B)  directly proportional to I2. 
C)  directly proportional to I. 
D)  none of these. 
A)  inversely proportional to I. 
B)  directly proportional to I2. 
C)  directly proportional to I. 
D)  none of these.

Question 12

Three resistors,10 Ω,20 Ω,and 30 Ω,are wired in series and connected to a 120-V battery.How much current flows in the circuit?

Accepted Answer

The answer of Three resistors,10 Ω,20 Ω,and 30 Ω,are wired...

Question 13

A motor converts

Accepted Answer

A)  electricity into magnetism. 
B)  electrical energy into mechanical energy. 
C)  mechanical energy into electrical energy. 
D)  force into power. 
A)  electricity into magnetism. 
B)  electrical energy into mechanical energy. 
C)  mechanical energy into electrical energy. 
D)  force into power.

Question 14

A transformer with 600 turns on the primary coil is used to decrease the voltage from 3000 V to 120 V for home use.How many turns should be in the secondary coil?

Accepted Answer

A)  600 turns 
B)  15000 turns 
C)  24 turns 
D)  3720 turns 
A)  600 turns 
B)  15000 turns 
C)  24 turns 
D)  3720 turns

Question 15

Voltage is defined as the ______________ per unit ______________.

Accepted Answer

A)  charge; current 
B)  work; current 
C)  charge; work 
D)  work; charge 
A)  charge; current 
B)  work; current 
C)  charge; work 
D)  work; charge

Question 16

The unit of electric current is the ______________.

Accepted Answer

The answer of The unit of electric current is the...

Question 17

For an ohmic conductor,current is

Accepted Answer

A)  directly proportional to voltage. 
B)  directly proportional to resistance. 
C)  independent of resistance. 
D)  independent of voltage. 
A)  directly proportional to voltage. 
B)  directly proportional to resistance. 
C)  independent of resistance. 
D)  independent of voltage.

Question 18

The unit for current is the

Accepted Answer

A)  ampere. 
B)  ohm. 
C)  coulomb. 
D)  volt. 
A)  ampere. 
B)  ohm. 
C)  coulomb. 
D)  volt.

Question 19

A(n)______________ is an elementary particle with a charge of +1.6 × 10-19 C.

Accepted Answer

A)  electron 
B)  neutron 
C)  proton 
D)  atom 
A)  electron 
B)  neutron 
C)  proton 
D)  atom

Question 20

The electric company charges a home on the basis of consumption of

Accepted Answer

A)  resistance. 
B)  energy. 
C)  current. 
D)  voltage. 
E)  power. 
A)  resistance. 
B)  energy. 
C)  current. 
D)  voltage. 
E)  power.

Exam 8: Electricity and Magnetism

An object that is positively charged will

A component in an automobile 12-V electrical system has a resistance of 90 Ω.How much current is in the component when in operation?

The electrical power dissipated in an appliance depends on

The abbreviation of the unit of resistance is

A system of a proton and an electron has a net charge of

A 10-Ω resistor and a 20-Ω resistor are connected in parallel,and this combination is connected in series to a 30-Ω resistor.If the arrangement is hooked to a 12-V battery,how much current flows in the circuit?

Voltage has the units of ______________,which is called a volt.

Ohm's law gives the relationship between

A steady current of 0.15 A exists in a wire for 20 s. a. How much net charge passes by a point in the wire? b. How many electrons does this charge represent?

A ferromagnetic material is magnetized by the alignment of

The electrical power dissipated by a resistance R is

Three resistors,10 Ω,20 Ω,and 30 Ω,are wired in series and connected to a 120-V battery.How much current flows in the circuit?

A motor converts

A transformer with 600 turns on the primary coil is used to decrease the voltage from 3000 V to 120 V for home use.How many turns should be in the secondary coil?

Voltage is defined as the ______________ per unit ______________.

The unit of electric current is the ______________.

For an ohmic conductor,current is

The unit for current is the

A(n)______________ is an elementary particle with a charge of +1.6 × 10-19 C.

The electric company charges a home on the basis of consumption of

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