An electromagnet is different from a permanent magnet because an
electromagnet ________.
is magnetic
can push and pull
can attract some metals
can turn on and off
Resistance to electricity is measured in ______.
watts
amps
volts
ohms
. An electromagnet works because _______.
moving electrons generate magnetic forces
alternating current completes a circuit
a generator is powerful
electrons flow through copper wire
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An electromagnet is different from a permanent magnet because an electromagnet:
1. is magnetic: Yes, an electromagnet is magnetic, just like a permanent magnet.
2. can push and pull: Yes, an electromagnet can exert a pull or push force on magnetic materials.
3. can attract some metals: Yes, an electromagnet can attract certain metals such as iron or steel.
4. can turn on and off: Yes, one of the key features of an electromagnet is that its magnetic field can be controlled by turning the electric current on or off.
Resistance to electricity is measured in ohms.
An electromagnet works because moving electrons generate magnetic forces. When electric current flows through a wire, the electrons in the wire move, creating a magnetic field around the wire. This magnetic field can be enhanced by coiling the wire into a coil, called a solenoid, and further strengthened by wrapping the coil around a magnetic core material, typically iron. By controlling the electric current flowing through the wire, the strength of the magnetic field generated by the electromagnet can be controlled.
To answer the first question, An electromagnet is different from a permanent magnet because an electromagnet can turn on and off.
To understand why this is the case, let's break it down:
1. An electromagnet is magnetic: Just like a permanent magnet, an electromagnet can produce a magnetic field.
2. An electromagnet can push and pull: When an electric current flows through the coil of wire in an electromagnet, it generates a magnetic field. This magnetic field can attract or repel objects, allowing the electromagnet to push or pull them.
3. An electromagnet can attract some metals: The magnetic field produced by an electromagnet can attract certain metals, such as iron or steel. When the electric current is flowing, it creates a temporary magnet, which can attract these materials.
4. An electromagnet can turn on and off: Unlike a permanent magnet, which always produces a magnetic field, an electromagnet can be switched on or off. This is because an electromagnet relies on an electric current for its magnetic properties. When the current is flowing, the electromagnet is active and produces a magnetic field. When the current is switched off, the magnetic field disappears.
Now, moving on to the second question:
Resistance to electricity is measured in ohms.
Resistance is a fundamental property of any conductor, which opposes the flow of electric current. It is measured in ohms (Ω), named after the German physicist Georg Simon Ohm.
Finally, let's answer the third question:
An electromagnet works because moving electrons generate magnetic forces.
When an electric current flows through a wire, the moving electrons generate a magnetic field around the wire. This is the basic principle behind how electromagnets work. By coiling the wire and passing an electric current through it, the magnetic field becomes stronger and can attract or repel objects. The more turns in the coil and the stronger the current, the stronger the magnetic field produced by the electromagnet.
Alternating current and generators are related to the production and distribution of electricity, but the fundamental principle behind an electromagnet is the generation of a magnetic field by moving electrons in a wire.