electromagnet experiment bbc bitesize

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Electromagnets and electromagnetism teaching resources

Worksheets and lesson ideas to challenge students aged 11 to 16 to think hard about electromagnetism (gcse and key stage 3).

There isn’t a lesson I love more than challenging students to figure how how a bell works! It’s a beautiful problem to solve where students have to use their knowledge of circuits, magnets and electromagnets. Here is a great animation of a bell that you can use to stimulate some thinking.

The electromagnet challenge!

• the current flowing through the electromagnet
• the number of turns of wire of the electromagnet

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Cyberphysics - a web-based teaching aid - for students of physics, their teachers and parents....

Teachers give this web link resource to your class

Electromagnets - Electromagnetism and magnetism - KS3 Physics Revision - BBC Bitesize

Web link resource   by abigail newton, measure skills from any curriculum.

Tag the questions with any skills you have. Your dashboard will track each student's mastery of each skill.

• edit the questions
• save a copy for later
• start a class game
• automatically assign follow-up activities based on students’ scores
• assign as homework
• share a link with colleagues
• print as a bubble sheet

KS3 Physics

Electromagnets.

A magnetic field is created when an electric current flows through a wire. This can be used to create an electromagnet . The diagram below shows a simple electromagnet, consisting of a coil wrapped around an iron nail.

The word  electro magnet  can be split into two parts. ‘ Electro ‘ relates to electricity and ‘ magnet ‘ relates to magnetism. An electromagnet is a temporary magnet that produces a magnetic field when an electric current passes through a coil. The magnetic field will disappear when the current stops.

If the current is flowing upwards in the wire, as indicated by the red arrows, it will produce a circular magnetic field around the wire.

The arrows in the diagram above show the direction of the magnetic field. However, rather than being a straight wire, in an electromagnet, the wire is coiled.

When current flows through the coil of wire, the resulting magnetic field looks similar to the magnetic field of a bar magnet.

In this example, the coil of wire produces a magnetic field that flows out from the north pole and into the south pole.

The two open ends of the coil are attached to a power supply. Once you turn on the power supply and current is flowing through the wire, a magnetic field will be produced. When you turn off the power supply, the electromagnet loses its magnetism. This makes it useful for moving magnetic objects by picking them up and dropping them off in different places.

Making Electromagnets Stronger

You might want to make the electromagnet stronger, and you can do so in three different ways:

1.   Wrapping the coil around an iron core

2.  Increasing the current flowing through the coil

• To increase the current flow, you can increase the potential difference using your power supply

3.   Increasing the number of turns of the coil

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Magnetism: Electromagnetism

Electromagnets.

• An electromagnet is a type of magnet that is created by an electric current.
• It consists of a coil of wire, often wound around a soft iron core. The iron core becomes magnetised when current flows through the coil.
• The strength of the magnetic field produced by an electromagnet can be increased by using more turns of wire in the coil, increasing the electric current through the coil, or using a larger and more permeable core material.
• Electromagnets have the advantage of being able to be turned on and off by controlling the electrical current flowing through the coil.
• Unlike permanent magnets, electromagnets can have their polarity reversed by changing the direction of the electric current.
• Common uses of electromagnets include in electric motors, generators, loudspeakers, memory devices, and magnetic resonance imaging (MRI) machines.

The Motor Effect

• The motor effect is a phenomenon where a force is exerted on a wire which is carrying an electric current and is placed in a magnetic field.
• The force is at a maximum when the wire is perpendicular to the magnetic field lines, and is zero when the wire is parallel to the field lines.
• The direction of the force can be determined using Fleming’s left-hand rule.
• The magnitude of the force is directly proportional to the strength of the magnetic field, the amount of current, and the length of wire in the magnetic field.
• This effect is employed in electric motors to produce rotational motion.

Electromagnetic Induction

• Electromagnetic induction is the phenomenon where a voltage or electromotive force (EMF) is induced in a conductor when it experiences a changing magnetic field.
• The rate of change of the magnetic field, the area of the loop, and the number of turns in the loop all affect the magnitude of the induced EMF.
• This principle is used in generators to convert mechanical energy into electrical energy and in transformers to increase or decrease the voltage of alternating current (AC).
• Lenz’s law states that the direction of the induced current is such that it will oppose the change that created it.

The Generator Effect

• The generator effect takes advantage of electromagnetic induction to transform mechanical energy into electrical energy, typically by rotating a coil in a magnetic field.
• The output is an alternating current. The frequency of the AC output is directly proportional to the speed of rotation.
• If a piece of metal wire moves relative to a magnetic field or if the magnetic field through a loop of wire changes, a potential difference is induced. This is called the generator effect.
• The generator effect underpins the operation of generators, alternators, and dynamos.