effects of electricity.ppt

8/10/2019 effects of electricity.ppt

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Electrical energy can be transformed into other forms of energy to

produce many effects

Effects of an

Electric Current


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Heating Effect of a Current

When electricity passes through metallicwires with high resistance, they become

hot and they glow. The heating effect of electric current is

used in many everyday devices. Electriccookers, kettles and toasters are among

the household appliances that rely on it.


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Heating Appliances


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Magnetic Effect of a Current

Electric current passing through a wiregenerates a magnetic field around the wire.This effect is used in all sorts of ways.

Examples include electric motors andelectromagnets.

Another widespread example is theloudspeaker, where variations in themagnetic effect of an electric current aretranslated into sound waves that we canhear.


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Magnetic Effect of a Current

Used in many applications

Gives a magnetic field that can be switched onand off when desired


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Applications of the Magnetic Effectof Current

Giant electromagnet

Telephone

Electric motors


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Liquids such as salt water, vinegar and copper sulphatesolution allow electricity to pass through them

Liquids are known as electrolytes

ChemicalEffect of a

Current


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Chemical Effect of a Current

Passing an electric current through aliquid causes chemical changes in aprocess called electrolysis.Electroplating uses electrolysis to put alayer of one metal on top of another.

Examples include chromium plating of

bathroom and car parts, and silver platingof cutlery and jewellery.


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ELECTROPLATING

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Applications of Electroplating


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QUIZ (Identification) When electricity passes through a metallic

wires with high resistance they become

________1) and they _________2).

Loud speaker is an example of________3) effect of electricity.

Magnetic poles are _______4) and

______5) The greater the ______6) the greater the

heat produce.

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The longer the wire the ________7) is the

resistance.

Salt water and vinegar are examples of

________8) used in electrolysis,

_________9) uses electrolysis to transfer

one layer of metal on top of another.

When a current passes through a wire,

__________10) is generated around the

wire.

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Exchange papers and write

corrected by on the bottom right

of the paper.

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QUIZ (Identification) When electricity passes through a metallic

wires with high resistance they become

Hot 1) and they glow 2).

Loud speaker is an example ofmagnetic 3) effect of electricity.

Magnetic poles are north4) and south 5)

The greater theresistance 6) the higher theheat produce.

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The longer is the wire the higher7) is the

resistance.

Salt water and vinegar are examples of

electrolytes8) used in electrolysis,

Electroplating 9) uses electrolysis to

transfer one layer of metal on top ofanother.

When a current passes through a wire,

magnetic field 10) is generated around thewire.

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