All AP Physics 2 Resources
Example Questions
Example Question #11 : Circuit Power
Calculate the power being dissipated by
None of these
The first step is to find the total resistance of the circuit.
In order to find the total resistance of the circuit, it is required to combine all of the parallel resistors first, then add them together as resistors in series.
Combine with
,
with
,
with
.
Then, combining with
and
:
Ohms is used law to determine the total current of the circuit
Combing all voltage sources for the total voltage.
Plugging in given values,
It is true that the voltage drop across parallel resistors must be the same, so:
Using ohms law:
It is also true that:
Using Subsitution:
Solving for :
Pluggin in values:
Using the definition of electric power, where is current and
is the resistance of the component in question.
Example Question #251 : Electricity And Magnetism
Calculate the power being dissipated by
None of these
The first step is to find the total resistance of the circuit.
In order to find the total resistance of the circuit, it is required to combine all of the parallel resistors first, then add them together as resistors in series.
Combine with
,
with
,
with
.
Then, combining with
and
:
Ohms is used law to determine the total current of the circuit
Combing all voltage sources for the total voltage.
Plugging in given values,
It is true that the voltage drop across parallel resistors must be the same, so:
Using ohms law
It is also true that:
Using Subsitution:
Solving for :
Plugging in values:
Using the definition of electrical power, where is current and
is the resistance of the component in question.
Example Question #11 : Circuit Power
Calculate the power being dissipated by
None of these
The first step is to find the total resistance of the circuit.
In order to find the total resistance of the circuit, it is required to combine all of the parallel resistors first, then add them together as resistors in series.
Combine with
,
with
,
with
.
Then, combining with
and
:
Ohms is used law to determine the total current of the circuit
Combing all voltage sources for the total voltage.
Plugging in given values,
It is true that the voltage drop across parallel resistors must be the same, so:
Using ohms law
It is also true that:
Using Subsitution:
Solving for :
Pluggin in values:
Using the definition of electrical power, where is current and
is the resistance of the component in question:
Example Question #14 : Circuit Power
What is the power being dissapaited by ?
None of these
,
, and
are in parallel, so they are added by using:
Plugging in given values:
,
, and
are in series. So they are added conventionally:
Plugging in values:
First, it is necessary to find the total current of the circuit. Using Ohm's law:
Solving for :
The total current of the circuit is also the current through
Using the definition of electric power, where is current and
is the resistance of the component in question:
Example Question #11 : Circuit Power
What is the power being dissapaited by ?
None of these
,
, and
are in parallel, so they are added by using:
Plugging in given values:
,
, and
are in series. So they are added conventionally:
Plugging in values:
First, it is necessary to find the total current of the circuit. Using Ohm's law:
Solving for :
Because ,
and
are in parallel,
Also, the voltage drop must be the same across all three since they are in parallel.
Using Ohm's law again and substituting:
Using algebraic subsitution:
Solving for :
Plugging in values:
Using the definition of electric power, where is current and
is reistance.
Example Question #92 : Circuit Properties
What is the power being dissapaited by ?
None of these
,
, and
are in parallel, so they are added by using:
Plugging in given values:
,
, and
are in series. So they are added conventionally:
Plugging in values:
First, it is necessary to find the total current of the circuit. Using Ohm's law:
Solving for :
Because ,
and
are in parallel,
Also, the voltage drop must be the same across all three since they are in parallel.
Using Ohm's law again and substituting:
Using algebraic subsitution:
Solving for
Plugging in values:
Using the definition of electrical power, where is the current and
is the resistance of the component in question:
Example Question #91 : Circuit Properties
What is the power being dissapaited by ?
None of these
,
, and
are in parallel, so they are added by using:
Plugging in given values:
,
, and
are in series. So they are added conventionally:
Plugging in values:
First, it is necessary to find the total current of the circuit. Using Ohm's law:
Solving for :
Because ,
and
are in parallel,
Also, the voltage drop must be the same across all three since they are in parallel.
Using Ohm's law again and substituting:
Using algebraic subsitution:
Solving for
Plugging in values
Using the definition of electrical power, where is current and
is the resistance of the component in question:
Plugging in values
Example Question #91 : Circuit Properties
Calculate the power being dissipated by
None of these
The first step is to find the total resistance of the circuit.
In order to find the total resistance of the circuit, it is required to combine all of the parallel resistors first, then add them together as resistors in series.
Combine with
,
with
,
with
.
Then, combining with
and
:
Ohms is used law to determine the total current of the circuit
Combing all voltage sources for the total voltage.
Plugging in given values,
The voltage drop across parallel resistors must be the same, so:
Using ohms law:
It is also true that:
Using Subsitution
Solving for :
Plugging in values
Using the definition of electrical power, where is current and
is the resistance of the component in question:
Example Question #92 : Circuit Properties
Calculate the power being dissipated by
None of these
The first step is to find the total resistance of the circuit.
In order to find the total resistance of the circuit, it is required to combine all of the parallel resistors first, then add them together as resistors in series.
Combining with
,
with
,
with
.
Then, combining with
and
:
Ohms is used law to determine the total current of the circuit
Combing all voltage sources for the total voltage.
Plugging in given values,
The voltage drop across parallel resistors must be the same, so:
Using ohms law:
It is also true that:
Using Subsitution
Solving for :
Using the definition of electrical power, where is current and
is the resistance of the component in question:
Example Question #11 : Circuit Power
A single battery is in series with several Ohmic resistors. How will the power output of the circuit change if a second
battery is added in series?
Tripled
Quartered
Quadrupled
Halved
Doubled
Quadrupled
The power dissipated by the resistor will be
Using Ohm's Law:
And changing the equation to be exclusively in terms of voltage and resistance:
From this, it can be seen that doubling the voltage will quadruple the power.
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