## What does an electromagnet use to generate a magnetic field?

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the center of the coil.

## What are the necessary parts needed to make an electromagnet?

Each group needs:

• nail, 3-inch (7.6 cm) or longer (made of zinc, iron or steel, but not aluminum)
• 2 feet (. 6 m) insulated copper wire (at least AWG 22 or higher)
• D-cell battery.
• several metal paperclips, tacks or pins.
• wide rubber band.
• Building an Electromagnet Worksheet.

## What 3 main parts do you need to make an electromagnet?

The basic components of an electromagnet are a wire and a power source. The power source may be AC (alternating current) or DC (direct current). The wire may be of any shape.

## What are 2 ways to strengthen an electromagnet?

Putting a piece of iron or steel inside the coil makes the magnet strong enough to attract objects. The strength of an electromagnet can be increased by increasing the number of loops of wire around the iron core and by increasing the current or voltage.

## How does voltage affect an electromagnet?

2 Answers. Voltage causes current to flow. You may be familiar with Ohm’s Law, where current flowing across a resistor (the electromagnet in this case) is proportional to the voltage across it. Thus, if the voltage across the electromagnet is increased, the current flowing through it will increase too.

## What 3 things affect the resistance of a wire?

There are several factors that affect the resistance of a conductor;

• material, eg copper, has lower resistance than steel.
• length – longer wires have greater resistance.
• thickness – smaller diameter wires have greater resistance.
• temperature – heating a wire increases its resistance.

## Which of the following will increase the resistance of a wire?

Increasing the resistivity of the material the wire is composed of will increase the resistance of the wire. Increasing the cross-sectional area of the wire will increase the resistance of the wire. Increasing the length of the wire will increase the resistance of the wire.

## How much is too much resistance in a wire?

resistance of wiring should ideally be zero. the DMM puts out so little current that even a wire with every strand but one broken should read close to zero. maybe one or two tenths of an ohm, tops. as stated, bending should not matter.