Magnetism

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— is a FORCE LIKE GRAVITY and the strong and weak forces inside the nucleus of an atom.

Magnetism

MAGNETIC FORCES pull or push objects by GENERATING the so called —

magnetic field.

Magnets have the ability to attract materials that are — in nature.

magnetic

LIKE poles — and UNLIKE poles — each other.

repel, attract

When allowed to HANG FREELY, magnets always ALIGN in —

one particular direction.

Magnetic POLES always occur in —.

pairs

A — is a region in which a magnetic force can be detected.

magnetic field

— are used to VISUALIZE THE MAGNETIC FIELD and provide us the measure of the field’s strength.

Magnetic field lines

The NUMBER OF MAGNETIC FIELD LINES passing through a given region is called the —

magnetic flux.

•The SI unit of the magnetic field strength (B) is the —, in honor of Serbian-American physicist —.

tesla (T), Nikola Tesla

One tesla is equal to —.

one newton per ampere-meter

Its — is equal to the NUMBER of FLUX LINES per unit AREA of a MAGNETIC FIELD.

magnitude

The SI unit of MAGNETIC FLUX is the —, in honor of —

weber, Wilhelm Weber.

a bar of soft iron placed inside the coil, where electricity passes through.

Electromagnet

– converts electrical energy into mechanical energy.

Electric motor

– are devices which measure electric current.

•Current meters

– measures SMALL amounts of electric current.

Galvanometer

– is a galvanometer with PARALLEL RESITOR and is connected in series with the load to measure the current passing through it.

Ammeter

– is a GALVANOMETER with SERIES RESISTOR and VOLTAGE in parallel with the load to measure voltage across it.

Voltmeter

– is the CREATION of an ELECTROMOTIVE FORCE by way of a MOVING MAGNETIC FIELD around an ELECTRIC CONDUCTOR and conversely the creation of current by moving an electric conductor through a static magnetic field.

Electromagnetic induction

– converts MECHANICAL energy TO ELECTRICAL energy.

Generators

Any device that CREATED AN ELECTRIC CURRENT by turning a coil of WIRE through magnetic field is a —.

generator

Most GENERATORS produce ALTERNATING CURRENT, so they are called —, aka —

AC generators, alternators

Voltage and current in AC circuits can be INCREASED OR DECREASED using a device called a .

transformer

ELECTRICITY produced by generating stations are not delivered directly to consumers. It PASSED through several devices before it is delivered to —.

transmission lines

There are also provisions for instant shut down of parts of the system when SHORT CIRCUIT occurs. These devices are called —

circuits breakers.

INCREASING VOLTAGE of ELECTRICITY from generators is done by step up —. To deliver high current by low voltage, cables of large diameters are used.

transformers

A — REDUCES the voltage to a SAFE LEVELl for distribution through streets

primary distribution system

. A — FURTHER REDUCES the VOLTAGE to much lower level. At this level, homes, stores, offices and other establishments can SAFELY OPERATE electrical devices

secondary distribution system

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