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    Category Archives: Chapter 7 Electricity

    Uses of Electromagnets

    15Jul

    Electric bell.

    In an electric bell, the electromagnet is switched on and off very rapidly by making and breaking the contact.

    When you press the switch, current flows in the coil, creating an electromagnet. The electromagnet then attracts

    the hammer towards the gong to hit it. When the hammer moves towards the gong, the contact opens. Thecircuit is broken and the current stops flowing. The coil loses its magnetism and the hammer returns to its

    original position, completing the circuit again. In this way, the hammer hits and lifts off from the gong

    repeatedly making the bell ring as long as the switch is on.

    Maglev Train

    Maglev trains use magnetic levitation propulsion systems. In this system, the cable coils generate a traveling

    magnetic field that moves down the length of the guideway. Magnetic attraction between this field and

    electromagnets on the train levitates the vehicle and drags it along behind the traveling magnetic field. Thesetrains can achieve a very high speed of 500 Kmh-1 because there is no contact friction between the train and the

    rails.

    This type of train is a very safe mode of transport. There is no danger of derailment because the train cannot

    move sideway off the guideway. The braking system is also very effective. When the polarity of the traveling

    magnetic wave is reversed, the train is stopped without skidding. In addition, many such trains can use the samerails without fear of collision because the train can never overtake the traveling magnetic field. However,maglev transport systems have not been commercially successful because of the high cost involved in

    constructing new network of guideways for the train.

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    Posted byperawatsiberon 15/07/2011 inChapter 7 - Electricity,Sains Ting 3 ( Form 3 ) - PMR

    Electromagnet 2

    15Jul

    Field Pattern of a Flat Coil

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    A solenoid is a long coil made up of a numbers of turns of wire.

    The magnetic field of a solenoid resembles that of the long bar magnet, and it behaves as if it has a North Pole

    at one end and a South Pole at the other.

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    The right-hand grip rule can also be used to indicate the direction of the magnetic field around a coil. The right-

    hand grip rule for a solenoid, in this case, the thumb points towards the north pole of the magnetic field whilethe fingers indicate the direction of the current in the solenoid.

    Magnetic Field Strength

    A magnetic field exists whenever a current is present. When an electrical appliance is switched on, there is a

    magnetic field around it. The field strength increases with current. Thus, a stronger magnetic field exists near

    appliances which use a bigger current. However, the strength of the magnetic field decreases with distance froma current-carrying source.

    Electric fields are shielded by most objects, such as walls, buildings and trees but magnetic fields are not. Inspite of being buried in the ground, magnetic fields of power lines are still not eliminated.

    Leave a comment

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    Posted byperawatsiberon 15/07/2011 inChapter 7 - Electricity,Sains Ting 3 ( Form 3 ) - PMR

    Electromagnetism

    14Jul

    Magnetic field around a wire

    When a charged particlesuch as an electron, proton or ionis in motion, magnetic lines of force rotate

    around the particle. Since electrical current moving through a wire consists of electrons in motion, there is amagnetic field around the wire.

    This field can be demonstrated by placing fine iron filings or shavings on a card and sticking a wire through the

    middle of the card. When a DC electrical current is passed through the wire, the iron filings align to show the

    magnetic field.

    Right-hand rule for magnetic field

    The right-hand rule for determining the direction of the magnetic field is that if you wrapped your right handaround a wire with your thumb pointing in the direction of the electrical current, then your fingers would be in

    the direction of the magnetic field.

    You can verify the direction of the magnetic field by placing one or more compasses on a card and observing

    their direction.

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    Posted byperawatsiberon 14/07/2011 inChapter 7 - Electricity,Sains Ting 3 ( Form 3 ) - PMR

    Magnetic field14Jul

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    Posted byperawatsiberon 14/07/2011 inChapter 7 - Electricity,Sains Ting 3 ( Form 3 ) - PMR

    Magnetism

    14Jul

    What is a magnet? A magnet is any material that possesses a magnetic field. This field exerts forces on any

    ferromagnetic material within its vicinity. Not all metals are attracted to magnets. Gold, aluminum, silver, andcopper are considered non-ferromagnetic metals, i.e., they are not attracted to magnets.

    Ferromagnetic materials are Iron, Nickel, Cobalt, and alloys containing them. When a magnet comes in contact

    with a ferromagnetic material, the atoms become lined up. This results in a magnetic force between the

    ferromagnetic material and the magnet.

    Magnets have two poles. These poles decide whether the ferromagnetic material is going to repel or attract. The

    attraction of two magnets will happen if the poles are opposite. For example, if the magnets are positive topositive they will repel; if they are negative to positive they attract and stick together.

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    Posted byperawatsiberon 14/07/2011 inChapter 7 - Electricity,Sains Ting 3 ( Form 3 ) - PMR

    Series circuit and Parallel circuit

    06Jun

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    Posted byperawatsiberon 06/06/2011 inChapter 7 - Electricity,Sains Ting 3 ( Form 3 ) - PMR

    Ohms Law The relationship between voltage, current and

    resistance

    06Jun

    The Ohms law states that the current flowing through a conductor is directly proportional to its voltage.This

    relationship between voltage (V), current (I) and resistance (R) was observed by Georg simon Ohm in 1827.

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    Ohms Law Part 1: Units and Quantities

    Ohms Law Part 2: Ohms Law Applied to Simple Circuits

    Further discussion on Ohms law .

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    Posted byperawatsiberon 06/06/2011 inChapter 7 - Electricity,Sains Ting 3 ( Form 3 ) - PMR

    Voltage and Current, Part 1 & Part 2

    25May

    Voltage and Current , Part 1

    Voltage and current, Part 2

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    Posted byperawatsiberon 25/05/2011 inChapter 7 - Electricity,Sains Ting 3 ( Form 3 ) - PMR

    Electricity and Circuits

    25May

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    Posted byperawatsiberon 25/05/2011 inChapter 7 - Electricity,Sains Ting 3 ( Form 3 ) - PMR

    Van De graaff generator

    16May

    The Van de Graaff generator is a device that can produce electrostatic charges of very high voltage on its dome.

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    Posted byperawatsiberon 16/05/2011 inChapter 7 - Electricity,Sains Ting 3 ( Form 3 ) -

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