All SAT II Physics Resources
Example Questions
Example Question #1 : Electricity And Magnetism
If a circuit contains a battery and a resistor what is the current of the circuit?
Ohm's law states:
Where is voltage, is current, and is resistance.
We can substitute the given values from the question into the equation and solve:
Example Question #41 : Electric Circuits
There are three resistors in parallel in a circuit with resistances of , , and .
What is the equivalent resistance?
The equation for resistors in parallel is:
We are given the values of the resistors. Using this formula, we can solve for the equivalent resistance.
Plug in the given values and solve.
Example Question #1 : Electricity
A voltage of applied between the ends of a wire results in a current of . What is the resistance of the wire?
This question can be solved using Ohm's law:
We are given the voltage and the current. Using these values, we can solve for the resistance.
Example Question #2 : Electric Circuits
A capacitor with capacitance is constructed by putting a thin piece of cardboard between two copper plates, then each plate is connected to a battery. If the copper plates are cut in half then what is the effect on the capacitance of the circuit?
Capacitance of a circuit is defined by the equation:
Where is the capacitance, is a constant of nature, is the area of the capacitor, and is the distance between the two plates
Since the metal plates are cut in half, the area is halved. We can substitute in for
The result is that the capacitance is half the original quantity.
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