To make an electromagnet, you need a power source (such as a battery), a conductive wire or coil, and a ferromagnetic core (such as iron). When an electric current flows through the wire, a magnetic field is created in the core, turning it into a magnet.
An electric current must flow through the coil of wire to make the electromagnet work. This current creates a magnetic field around the coil, inducing magnetism.
To make an electromagnet work, you need an electric current flowing through a coil of wire, which is not needed for a regular magnet.
An electromagnet must have a current flowing through its coil of wire in order to generate a magnetic field. When an electric current passes through the coil, it creates a magnetic field around the electromagnet.
An electromagnet must have an electric current passing through its coils to generate a magnetic field. The magnetic field is created as the electric current causes the alignment of the magnetic domains within the core material of the electromagnet, creating a magnetic field around the coil.
In order for work to be done, two things must be present: force and displacement. Force is applied to an object to move it, causing it to undergo a displacement in the direction of the force. Work is calculated as the product of force and displacement in the direction of the force.
An electric current must flow through the coil of wire to make the electromagnet work. This current creates a magnetic field around the coil, inducing magnetism.
A cell or other (DC) power source must, indeed, be connected to an electromagnet to make it work. It is an electromagnet. Surf the link to our friends at Wikipedia. It's a good article, and the pics are cool.
An electrical current will cause an electromagnet to energise.
To make an electromagnet work, you need an electric current flowing through a coil of wire, which is not needed for a regular magnet.
More than what? - An electromagnet can pick up metal due to its magnetism - assuming it is turned on. If you increase the current, the electromagnet becomes more powerful - but you must be careful not to pass too much current, otherwise the wires might burn through.
An electromagnet must have a current flowing through its coil of wire in order to generate a magnetic field. When an electric current passes through the coil, it creates a magnetic field around the electromagnet.
Vibration and a medium like air
Oxgen, Fuel and a heat source
Hester must confess his sins and repent in order to make things right with Dimmesdale.
An electromagnet must have an electric current passing through its coils to generate a magnetic field. The magnetic field is created as the electric current causes the alignment of the magnetic domains within the core material of the electromagnet, creating a magnetic field around the coil.
In order for respiration to occur, three things must be present: oxygen, a source of energy (such as glucose), and a metabolic system capable of breaking down the energy source to release energy for cellular processes.
Must is the present tense. I must You must He,She and It must We must You must They must