Name two electric devices for each where (i) heating effect of current is used and (ii) magnetic effect of current is used.
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Why are the conductors of electric heating devices, such as bread-toasters and electric irons,
The resistivity of an alloy is generally higher than that of its constituent metals. Alloys do nor oxidise (burn) readily at higher temperatures. Therefore, conductors of electric heating devices, such...
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Name the instrument used for measuring electric current flowing in an electric circuit.
An ammeter used for measuring an electric current flowing in an electric circuit.
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Name an instrument that measures electric current in a circuit. Define the unit of electric current.
An instrument that measures electric current in a circuit is called "ammeter". The unit of electric current is ampere (A). I ampere is constituted by the flow of 1 coulomb...
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Name some devices in which electric motors are used
Electric motors are used in electric fans, refrigerators, mixers, washing machines, etc.
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Name the scientist who discovered the relationship between electric current and magnetic field.
Danish physicist, H.C. Oersted established the relation between electricity and magnetism.
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It is established that an electric current through a metallic conductor produces a magnetic field around it. Is there a similar magnetic
(i) Yes, Alpha particles being positively charged constitute a current in the direction of motion. (ii) No. The neutrons being electrically neutral constitute no current.
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Think of six activities which use electric current. Also name the devices used to perform the activity
Activity you perform Device Get light ...
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Why many flowering plants have developed devices to discourage self-pollination ? Describe any two such out breeding devices in plants.
To avoid in breeding depression/to encourage cross pollination , i) pollen is released before the stigma becomes receptive or stigma becomes receptive much before the release of pollen. Blind ii) the anther...
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Explain the following: (i) The elements of electric heating devices such as bread- toasters
(i) Resistivity of an alloy is generally higher and it does not oxidize easily. So, the elements of electric heating devices such as bread-toasters and electric iron are made of...
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Explain the term : 'Heating effect of electric current'
(i) Heating effect of electric current : When an electric current is passed through a high resistance wire like nichrome, the resistance wire becomes very hot and produces heat. This...
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