Electromagnet
A magnet whose field is produced by electric , often using a coil and an iron core to concentrate the field. Its pull can be switched or changed by changing the current, which is why relays and contactors can use it. It differs from a permanent magnet that keeps its field without a supply.
Using Electromagnet in context
Updated
A distinction worth remembering
An electromagnet’s field is produced by current in a winding. Core material and geometry affect its behaviour; it is different from a permanent magnet even when both attract steel.
Questions to take further
- How can I revise Electromagnet beyond the definition?
- Explain what Electromagnet describes, compare it with a related term and use it in a topic question. State any assumptions and what evidence you would need before applying the idea to real work.
Sources
- OpenStax University Physics: Fields produced by coils — The physical principle used in this comparison; technical installation requirements remain separate.
Where Electromagnet fits in the learning path
The Electrical Science section covers these units:
- Circuit Fundamentals
Curriculum mapping: C&G 2365 Units 202/302.
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- Ohm's LawElectrical Science
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- Electrical Science — quiz previewFree · Electrical Science
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Recall a related term
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A coil of wire that produces a magnetic field when current flows. With a movable iron core it can pull a plunger, allowing electrical current to operate a mechanical part such as a relay. Reversing or removing the current changes the field; the term describes the coil arrangement, not a protective device.
Solenoid
Read the Solenoid entryCompare related terms
Open a meaning to compare its role with Electromagnet, or follow its full entry.
Solenoid
A coil of wire that produces a magnetic field when current flows. With a movable iron core it can pull a plunger, allowing electrical current to operate a mechanical part such as a relay. Reversing or removing the current changes the field; the term describes the coil arrangement, not a protective device.
Read the Solenoid entryMagnetic field
The region in which a magnet or current-carrying conductor can exert magnetic force. Drawn field lines show direction and give a visual guide to strength, but they are a model rather than physical wires. Changing magnetic flux through a coil can induce a voltage, linking this idea to motors and transformers.
Read the Magnetic field entryCurrent
Current is the rate at which electric charge flows, measured in amperes (A), often called amps. In a simple closed circuit, the supply drives current through the load and back to the source. Current is not used up by a lamp: energy is transferred there. A cable current rating describes how much current it can carry in stated conditions, not how much it always carries.
Read the Current entryA definition is a start. Using it in a real question is where it sticks.