Question 1

The unit of resistance is called a(n)

Accepted Answer

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

Question 2

The resistances are added in a(n)______________ circuit.

Accepted Answer

The answer of The resistances are added in a(n)______________ circuit....

Question 3

Three resistors,90 Ω,40 Ω,and 60 Ω,are wired in series and connected to a 120-V battery.What is the equivalent resistance for this circuit?

Accepted Answer

A)  190 Ω 
B)  19 Ω 
C)  0.053 Ω 
D)  216000 Ω 
A)  190 Ω 
B)  19 Ω 
C)  0.053 Ω 
D)  216000 Ω

Question 4

In a battery circuit with different resistors in parallel,

Accepted Answer

A)  the total resistance is larger than the value of the largest resistor. 
B)  the current is the same through each resistor. 
C)  the total resistance is larger than the value of the smallest resistor. 
D)  the voltage is the same across each resistor. 
A)  the total resistance is larger than the value of the largest resistor. 
B)  the current is the same through each resistor. 
C)  the total resistance is larger than the value of the smallest resistor. 
D)  the voltage is the same across each resistor.

Question 5

For electrical safety,

Accepted Answer

A)  electrical shocks caused by 1 A of current are of no concern. 
B)  fuses or circuit breakers are wired in series in circuits. 
C)  fuses larger than the rated value can be placed in a circuit. 
D)  fuses and circuit breakers are wired in parallel in circuits. 
A)  electrical shocks caused by 1 A of current are of no concern. 
B)  fuses or circuit breakers are wired in series in circuits. 
C)  fuses larger than the rated value can be placed in a circuit. 
D)  fuses and circuit breakers are wired in parallel in circuits.

Question 6

Three resistors,10 Ω,20 Ω,and 30 Ω,are wired in parallel and connected to a 12-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 7

A component in an automobile 12-V electrical system has a resistance of 20 Ω.
a. How much current is in the component when the system is in operation?
b. How much energy is dissipated by the component each second?

Accepted Answer

The answer of A component in an automobile 12-V electrical...

Question 8

For an ohmic conductor,current is

Accepted Answer

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

Question 9

In a dc motor,the polarity and current are reversed by a(n)______________.

Accepted Answer

(split-rin

Question 10

The source of magnetism is

Accepted Answer

A)  polarization. 
B)  magnetic monopoles. 
C)  electrons. 
D)  protons. 
A)  polarization. 
B)  magnetic monopoles. 
C)  electrons. 
D)  protons.

Question 11

The voltage in a house is measured to be 122.5 V.What is the current drawn by a 75.0-W light bulb?

Accepted Answer

The answer of The voltage in a house is measured...

Question 12

A generator is a device that converts

Accepted Answer

A)  heat energy into mechanical energy. 
B)  chemical energy into electrical energy. 
C)  mechanical energy into electrical energy. 
D)  electrical energy into mechanical energy. 
A)  heat energy into mechanical energy. 
B)  chemical energy into electrical energy. 
C)  mechanical energy into electrical energy. 
D)  electrical energy into mechanical energy.

Question 13

A system of 12 electrons and 18 protons has a net charge of

Accepted Answer

A)  9.6 × 10-19 C. 
B)  -9.6 × 10-19 C. 
C)  17.6 × 10-19 C. 
D)  6.0 × 10-19 C. 
E)  -17.6 × 10-19 C. 
A)  9.6 × 10-19 C. 
B)  -9.6 × 10-19 C. 
C)  17.6 × 10-19 C. 
D)  6.0 × 10-19 C. 
E)  -17.6 × 10-19 C.

Question 14

A circuit breaker is connected in ______________ in a circuit.

Accepted Answer

The answer of A circuit breaker is connected in ______________...

Question 15

Power may be expressed as _____________ times resistance.

Accepted Answer

The answer of Power may be expressed as _____________ times...

Question 16

If work is done on an electric charge,a ______________ is present.

Accepted Answer

A)  resistance 
B)  current 
C)  voltage 
D)  transformer 
E)  bigger charge 
A)  resistance 
B)  current 
C)  voltage 
D)  transformer 
E)  bigger charge

Question 17

A component in an automobile 12-V electrical system has a resistance of 20 Ω.How much energy is dissipated by the component each second?

Accepted Answer

A)  0.14 J 
B)  7.2 J 
C)  1.7 J 
D)  0.6 J 
A)  0.14 J 
B)  7.2 J 
C)  1.7 J 
D)  0.6 J

Question 18

An insulator has a positive electric charge of 2.4 × 10 -17 C.How many electrons were added or removed?

Accepted Answer

150 electr

Question 19

The mathematical form of Coulomb's law is similar to that of

Accepted Answer

A)  the second law of thermodynamics. 
B)  the second law of motion. 
C)  Kepler's second law. 
D)  the law of gravitation. 
A)  the second law of thermodynamics. 
B)  the second law of motion. 
C)  Kepler's second law. 
D)  the law of gravitation.

Question 20

Electric charge is measured in units of

Accepted Answer

A)  coulombs. 
B)  watts. 
C)  volts. 
D)  newtons. 
A)  coulombs. 
B)  watts. 
C)  volts. 
D)  newtons.

Exam 8: Electricity and Magnetism

The unit of resistance is called a(n)

The resistances are added in a(n)______________ circuit.

Three resistors,90 Ω,40 Ω,and 60 Ω,are wired in series and connected to a 120-V battery.What is the equivalent resistance for this circuit?

In a battery circuit with different resistors in parallel,

For electrical safety,

Three resistors,10 Ω,20 Ω,and 30 Ω,are wired in parallel and connected to a 12-V battery.How much current flows in the circuit?

A component in an automobile 12-V electrical system has a resistance of 20 Ω. a. How much current is in the component when the system is in operation? b. How much energy is dissipated by the component each second?

For an ohmic conductor,current is

In a dc motor,the polarity and current are reversed by a(n)______________.

The source of magnetism is

The voltage in a house is measured to be 122.5 V.What is the current drawn by a 75.0-W light bulb?

A generator is a device that converts

A system of 12 electrons and 18 protons has a net charge of

A circuit breaker is connected in ______________ in a circuit.

Power may be expressed as _____________ times resistance.

If work is done on an electric charge,a ______________ is present.

A component in an automobile 12-V electrical system has a resistance of 20 Ω.How much energy is dissipated by the component each second?

An insulator has a positive electric charge of 2.4 × 10 -17 C.How many electrons were added or removed?

The mathematical form of Coulomb's law is similar to that of

Electric charge is measured in units of

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An insulator has a positive electric charge of 2.4 × 10 -¹⁷ C.How many electrons were added or removed?