Chapter 20 : Electric Circuits Quizzes
All Solved
The positive terminal of a battery in a minivan has an electric potential that is a maximum of 12
V higher than the negative terminal. Complete the following sentence: When wires are
connected to the battery from the various electrical circuits within the minivan, the potential
difference between the two terminals is - Answer less than 12 V.
Which one of the following units are the correct SI units for the electromotive force (emf)? -
Answer volts (V)
Which one of the following statements concerning the conventional current is true? - Answer
The conventional current is the hypothetical movement of positive charges through the wires of
an electric circuit.
Through a certain cross-sectional area of a wire, one coulomb of electrons pass each second. In
this case, the current through the wire is equal to which one of the following choices? - Answer
one ampere
Which one of the following statements concerning the electric field in an electric circuit
containing a long wire attached across the terminals of a battery is false? - Answer The
electric field lies only within a thin region near the surface of the wires.
The unit of electrical current is the ampere (A). Which one of the combinations of units is
equivalent to the ampere? - Answer C/s
How is the direction of current flow defined in a conductor? - Answer It is in the direction
that positively-charged particles would move.
What is true about Ohm's law? - Answer -The ratio of the voltage applied across a wire to the
current flowing through it is constant.
-Resistance is expressed in ohms.
-Georg Simon Ohm discovered the law named after him.
-One ohm is equal to one volt divided by one ampere.
In most cases, Ohm's law is valid when which of the following conditions is satisfied? - Answer
when, for a given piece of material, the ratio V/I is the same for a wide range of voltages and
currents
, By which of the following methods could the current in a given circuit be doubled? - Answer
Either double the voltage or reduce the resistance to half of its initial value.
Complete the following sentence: the electrical resistivity of most metal wires is - Answer
much smaller than the values for most semiconductors.
In the fabrication of an electrical extension cord, the manufacturer wants to reduce the overall
resistance of the wires in the extension cord. Which of the following changes would result in the
lowest resistance? - Answer increase the diameter of the wires
Which one of the following types of materials exhibits the largest values of resistivity? - Answer
insulators
Which pair of terms correctly fills the blanks in the following sentence? ________ is a property
of an object while ________ is a property of a material. - Answer resistance, resistivity
Complete the following sentence: The SI unit for electric power is - Answer watt.
What kind of materials exhibit zero resistivity when the temperature is reduced below a critical
temperature for that material? - Answer superconductors
The SI unit of power is the watt. Which of the following units are equivalent to the watt? -
Answer V∙A
The type of current that flows through a refrigerator when it is plugged into a wall socket is
which of the following? - Answer alternating
In an ac circuit containing a generator and a resistance, the voltage fluctuates in a sinusoidal
manner. How does the current in such a circuit behave? - Answer The current also varies in a
similar sinusoidal manner.
Which of the following actions would significantly reduce the risk of fire when using an electric
heater connected to a wall outlet using an extension cord? - Answer use an extension cord
with smaller-gauge wires
Two identical resistors are connected in series across the terminals of an ideal battery with a
voltage V and a current I flows through the circuit. If one of the resistors is removed from the
circuit and the remaining one connected across the terminals of the battery, how much current
would flow through the circuit? - Answer 2I
All Solved
The positive terminal of a battery in a minivan has an electric potential that is a maximum of 12
V higher than the negative terminal. Complete the following sentence: When wires are
connected to the battery from the various electrical circuits within the minivan, the potential
difference between the two terminals is - Answer less than 12 V.
Which one of the following units are the correct SI units for the electromotive force (emf)? -
Answer volts (V)
Which one of the following statements concerning the conventional current is true? - Answer
The conventional current is the hypothetical movement of positive charges through the wires of
an electric circuit.
Through a certain cross-sectional area of a wire, one coulomb of electrons pass each second. In
this case, the current through the wire is equal to which one of the following choices? - Answer
one ampere
Which one of the following statements concerning the electric field in an electric circuit
containing a long wire attached across the terminals of a battery is false? - Answer The
electric field lies only within a thin region near the surface of the wires.
The unit of electrical current is the ampere (A). Which one of the combinations of units is
equivalent to the ampere? - Answer C/s
How is the direction of current flow defined in a conductor? - Answer It is in the direction
that positively-charged particles would move.
What is true about Ohm's law? - Answer -The ratio of the voltage applied across a wire to the
current flowing through it is constant.
-Resistance is expressed in ohms.
-Georg Simon Ohm discovered the law named after him.
-One ohm is equal to one volt divided by one ampere.
In most cases, Ohm's law is valid when which of the following conditions is satisfied? - Answer
when, for a given piece of material, the ratio V/I is the same for a wide range of voltages and
currents
, By which of the following methods could the current in a given circuit be doubled? - Answer
Either double the voltage or reduce the resistance to half of its initial value.
Complete the following sentence: the electrical resistivity of most metal wires is - Answer
much smaller than the values for most semiconductors.
In the fabrication of an electrical extension cord, the manufacturer wants to reduce the overall
resistance of the wires in the extension cord. Which of the following changes would result in the
lowest resistance? - Answer increase the diameter of the wires
Which one of the following types of materials exhibits the largest values of resistivity? - Answer
insulators
Which pair of terms correctly fills the blanks in the following sentence? ________ is a property
of an object while ________ is a property of a material. - Answer resistance, resistivity
Complete the following sentence: The SI unit for electric power is - Answer watt.
What kind of materials exhibit zero resistivity when the temperature is reduced below a critical
temperature for that material? - Answer superconductors
The SI unit of power is the watt. Which of the following units are equivalent to the watt? -
Answer V∙A
The type of current that flows through a refrigerator when it is plugged into a wall socket is
which of the following? - Answer alternating
In an ac circuit containing a generator and a resistance, the voltage fluctuates in a sinusoidal
manner. How does the current in such a circuit behave? - Answer The current also varies in a
similar sinusoidal manner.
Which of the following actions would significantly reduce the risk of fire when using an electric
heater connected to a wall outlet using an extension cord? - Answer use an extension cord
with smaller-gauge wires
Two identical resistors are connected in series across the terminals of an ideal battery with a
voltage V and a current I flows through the circuit. If one of the resistors is removed from the
circuit and the remaining one connected across the terminals of the battery, how much current
would flow through the circuit? - Answer 2I
