SAT II Physics : Electric Circuits

Study concepts, example questions & explanations for SAT II Physics

varsity tutors app store varsity tutors android store

Example Questions

Example Question #1 : Electricity And Magnetism

If a circuit contains a  battery and a  resistor what is the current of the circuit?

Possible Answers:

Correct answer:

Explanation:

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?

Possible Answers:

Correct answer:

Explanation:

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?

Possible Answers:

Correct answer:

Explanation:

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?

Possible Answers:

Correct answer:

Explanation:

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.

Learning Tools by Varsity Tutors