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Example Questions
Example Question #1 : Circuit Power
In the circuit above, find the power being dissipated by .
None of these
First, find the total resistance of the circuit.
and
are in parallel, so we find their equivalent resistance by using the following formula:
Next, add the series resistors together.
Use Ohm's law to find the current in the system.
The current through and
needs to add up to the total current, since they are in parallel.
Also, the voltage drop across them need to be equal, since they are in parallel.
Set up a system of equations.
Solve.
The equation for power is as follows:
Example Question #2 : Circuit Power
What can be said about the power being dissipated by and
?
will dissipate more power than
Their values will be equal
None of these
will dissipate more power than
It is impossible to tell
Their values will be equal
and
are in series with each other, therefore, they will have the same current values. They also have the same resistance values. Thus, they will have the same power dissipated, as
.
Example Question #4 : 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,
We know 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 electric 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 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
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