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Electromagnetism II
physics
Question | Answer |
---|---|
Electromagnetic force | 1 of 4 fundamental forces of nature. A push or pull of and object. |
Electromotive Force (EMF) | Any device that coverts some form of energy directly into electric energy. |
Battery | Is a source of electro motor force. |
Electric field | Voltage |
Electrons | Current |
A battery creates _________________________ . | Electric field that moves the electrons. |
The electric field and the electrons are in the __________ direction. | same. |
Electric potential is measured in ___________. | joules per coulomb or volt |
Single unit of electric charge is a ________. | Electron |
Motor is the ________ of a generator. | opposite |
A physicists conventional rule for electric current flow. | Right Hand Rule |
Current flow | Movement of electric charge |
Electron current flow is considered the ________ rule. | Left hand rule |
Electric current runs _____________. | Positive to negative |
Electron current flow runs ____________. | Negative to positive |
Oersted's Eperiment | An electric current produced a magnetic field strong enough to cause a magnetic compass to point toward the wire. |
A magnetic field associated with electron current flow through a wire produces a ____________________. | magnetic field represented by concentric circles. |
Electron current flow runs _______________. | North to south |
Left hand rule | Electron current flow produces magnetic flux line that run clockwise. |
Right hand rule | Electric current flow produces magnetic flux lines that run counter clockwise. |
Each coil has its own _____________. | magnetic field |
Solenoid | Is a helix + Electrical current |
Coil of wire | helix |
As long as there is a magnetic field flowing through the solenoid then there is a ___________. | magnetic field |
Current flowing through a loop is strongest ________________. | In the center of the loop |
Solenoid + Iron core | Electromagnet |
ferromagnetic material | Iron |
Advantage of an electromagnet | It can be turned on and off by varying current flow. |
Results from a movement of a magnet in or out of a coil. | Electromagnetic Induction |
Discovered that if a magnet is moved, a current flows in a coiled wire. | Faraday |
An electric current is induced to flow in a circuit if some part of that circuit is in a _________________. | changing magnetic field |
A changing magnetic field can be produced by moving a: 1) and 2) | 1) Bar magnet or an electromagnet near a coil of wire. 2) Coil of wire near a stationary magnetic field |