High School Physics : Electric Circuits
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Example Questions
Example Question #4 : Calculating Total Capacitance
What is the total capacitance of a series circuit with capacitors of 
The total capacitance of a series circuit is
Plug in our given values.
Example Question #1 : Calculating Total Capacitance
Calculate the total capacitance of a circuit with the following three capacitors in parallel.
To calculate the total capacitance for capacitors in parallel, simply sum the value of each individual capacitor.
Example Question #6 : Calculating Total Capacitance
Calculate the total capacitance of a circuit with the following three capacitors in series.
To find the total capacitance for capacitors in series, we must sum the inverse of each individual capacitance and take the reciprocal of the result.
Remember, you must still take the final reciprocal!
Example Question #3 : Capacitors
Three capacitors in parallel have a capacity of 
The formula for capacitors in parallel is:
Plug in our given values:
Example Question #1 : Using Capacitor Equations
Three capacitors in series have a capacity of 
The formula for capacitors in series is:
Plug in our given values:
Example Question #2 : Using Capacitor Equations
Three capacitors of equal capacitance are in a series circuit. If the total capacitance is 
The formula for capacitors in a series is:
Since we have three equal capacitors, we can say:
Using the value for total capacitance, we can find the value for the individual capacitance.
Example Question #12 : Capacitors
Three capacitors of equal capacitance are in a parallel circuit. If the total capacitance is 
The formula for capacitors in parallel is:
Since we have three equal capacitors, we can say:
Use the value for total capacitance to find the individual capacitance value.
Example Question #53 : Electric Circuits
What is the maximum power consumption of 
The power in a circuit is equal to the current times the voltage.
Example Question #54 : Electric Circuits
The total amount of charge that passes through a wire’s full cross section at any point per unit of time is referred to as
Wattage
Voltage
Current
Electric potential
Current
Current is defined as the amount of charge that passes through a specific area of a wire in a specific interval of time. It is measured in Amps which are Coulombs per second.
Example Question #55 : Electric Circuits
If the resistance in a constant voltage circuit is doubled, the power dissipated by that circuit
Increase by a factor of two
Decrease to one fourth its original value
Decrease to one half its original value
Increase by a factor of four
Decrease to one half its original value
Decrease to one half its original value
The equation for Power is
According to Ohm’s Law
We can rearrange this equation for current as this is what is changing in our circuit.
We can then substitute this back into the power equation.
If we have the original value
We can rearrange both for the voltage and set them equal to each other
We know that
So we can substitute this value in
And solve for
Therefore the power would be cut in half.
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