High School Physics : Electricity and Magnetism
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Example Questions
Example Question #11 : Electricity And Magnetism
A circuit has a current, 
There is insufficient information to solve
To solve this problem, use Ohm's law:
Since we are doubling the current, but the voltage is remaining the same, we can set our old and new equations equal to each other.
We know that the second current is equal to twice the first current.
Use this equation to substitute current into the first equation.
The initial current now cancels out from both sides.
Divide both sides by two to isolate the final resistance variable.
Example Question #11 : Electricity And Magnetism
Ohm's Law describes the relationship between which variables?
Power, resistivity, electromotive force
Voltage, current, resistance
Voltage, electric field, power
Resistance, power, electromotive force
Electric field, current, power
Voltage, current, resistance
Ohm's law can be written as:
It demonstrates that voltage is equal to the product of current and resistance within an electric circuit.
Example Question #12 : Use Ohm's Law
The current in a circuit is 
Ohm's law says 
Example Question #13 : Electricity And Magnetism
What is the current of a circuit with a voltage of 
For this problem, use Ohm's law: 
We can re-arrange the equation to solve specifically for 
Plug in the given values for voltage and resistance to solve for the current.
Example Question #14 : Electricity And Magnetism
What is the resistance in a circuit with a voltage of 
For this problem, use Ohm's law: 
We can re-arrange the equation to solve specifically for 
Plug in the given values for voltage and current and solve for resistance.
Example Question #12 : Electricity And Magnetism
What is the voltage of a circuit with 
For this problem, use Ohm's law: 
Plug in the given values and solve for the voltage.
Example Question #13 : Electricity And Magnetism
Ohm's Law describes the relationship between which variables?
Voltage, electric field, power
Resistance, power, electromotive force
Voltage, current, resistance
Power, resistivity, electromotive force
Electric field, current, power
Voltage, current, resistance
Ohm's law can be written as:
It demonstrates that voltage is equal to the product of current and resistance within an electric circuit.
Example Question #17 : Electricity And Magnetism
A circuit has a current, 
There is insufficient information to solve
To solve this problem, use Ohm's law:
Since we are doubling the current, but the voltage is remaining the same, we can set our old and new equations equal to each other.
We know that the second current is equal to twice the first current.
Use this equation to substitute current into the first equation.
The initial current now cancels out from both sides.
Divide both sides by two to isolate the final resistance variable.
Example Question #12 : Electricity And Magnetism
What is the power of a circuit with a current of 
The standard equation for power is:
We are given only current and reistance, meaning we must manipulate this equation so that only those variables are present. To do this, we can substitute Ohm's law for voltage.
Now we have an equation for power that uses only current and resistance. Plug in the values given in the question to find the final answer.
Example Question #1 : Understanding Series And Parallel
Each branch of a parallel circuit carries an equal __________.
resistance
voltage
power
capacitance
current
voltage
By definition, each branch of a parallel circuit will have the same voltage. The current, however, may be split between branches in inequal amounts. In contrast, a series circuit will carry a constant current throughout the circuit, but voltage may differ between elements.
Resistance and capacitance are dependent on the elements present in a given circuit, so no claims can be made. Power is similarly dependent on the elements present in a specific circuit.
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