Question

question #13
an electromagnet is

a step up transformer

a solenoid with a magnetic material placed in the wire coil

a single wire wrapped in a cylindrical wire coil

a step down transformer

question #14
a current of 2.0 amps passes through a 12 - ohm resistor. what is the voltage across the resistor?

12 volts

6.0 volts

24 volts

0.17 volts

Explanation:

Step1: Recall Ohm's Law

Ohm's Law is $V = IR$, where $V$ is voltage, $I$ is current and $R$ is resistance.

Step2: Identify given values

$I = 2.0$ A and $R=12$ $\Omega$.

Step3: Substitute values into formula

$V=2.0\times12$.
$V = 24$ V.

For Question #13:

An electromagnet is a solenoid (a coil of wire) with a magnetic - material core. A step - up or step - down transformer is used for changing voltage levels and is not an electromagnet. A single wire wrapped in a cylindrical wire coil is not the correct description of an electromagnet.

Answer:

A solenoid with a magnetic material placed in the wire coil

For Question #14: