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SAT II Physics : Resistors

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Example Question #2 : Electric Circuits

There are three resistors in parallel in a circuit with resistances of $10\Omega$ , $20\Omega$ , and $30\Omega$ .

What is the equivalent resistance?

Possible Answers:

$1\Omega$

$5.45\Omega$

$60\Omega$

$0.017\Omega$

$6000\Omega$

Correct answer:

$5.45\Omega$

Explanation:

The equation for resistors in parallel is:

$\frac{1}{R_{eq}}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}...$

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.

$\frac{1}{R_{eq}}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}...$

$\frac{1}{R_{eq}}=\frac{1}{10\Omega}+\frac{1}{20\Omega}+\frac{1}{30\Omega}...$

$\frac{1}{R_{eq}}=\frac{11}{60\Omega}$

$R_{eq}=\frac{60\Omega}{11}$

$R_{eq}=5.45\Omega$

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Example Question #3 : Electricity And Magnetism

A voltage of applied between the ends of a wire results in a current of 60A . What is the resistance of the wire?

Possible Answers:

$0.2\Omega$

$5\Omega$

$0.1\Omega$

$10\Omega$

$1\Omega$

Correct answer:

$0.1\Omega$

Explanation:

This question can be solved using Ohm's law:

V=IR

We are given the voltage and the current. Using these values, we can solve for the resistance.

6V=(60A)R

$R=\frac{6V}{60A}=0.1\Omega$

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SAT II Physics : Resistors

Study concepts, example questions & explanations for SAT II Physics

All SAT II Physics Resources

Example Questions

Example Question #2 : Electric Circuits

Example Question #3 : Electricity And Magnetism

All SAT II Physics Resources

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