coils of electric toasters and electric irons are mode of an alloy (generally nichrome) due to the following two reasons: (i) Resistivity of an alloy is generally higher than that of pure metals, hence for a given resistance we need a coil of lesser length. (ii) At high temperatures, an alloy does nRead more
coils of electric toasters and electric irons are mode of an alloy (generally nichrome) due to the following two reasons:
(i) Resistivity of an alloy is generally higher than that of pure metals, hence for a given resistance we need a coil of lesser length.
(ii) At high temperatures, an alloy does not oxidise (burn) readily. Hence, coil of an alloy has longer life.
The current flows more easily through a thick wire as compared to a thin wire of the same material, when connected to the same source. It is due to the reason that resistance of a thick wire is less than that of a thin wire.
The current flows more easily through a thick wire as compared to a thin wire of the same material, when connected to the same source. It is due to the reason that resistance of a thick wire is less than that of a thin wire.
SI unit of electric current is ampere. Current is said to be 1 ampere (1A), if 1 coulomb charge flows per second across a cross-section of a conductor.
SI unit of electric current is ampere. Current is said to be 1 ampere (1A), if 1 coulomb charge flows per second across a cross-section of a conductor.
An electric circuit is a continuous and closed path for flow of an electric current. If the electric circuit is complete, electric current can flow through the circuit. if the circuit is broken anywhere or switch of the circuit is turned off, the current stops flowing.
An electric circuit is a continuous and closed path for flow of an electric current. If the electric circuit is complete, electric current can flow through the circuit. if the circuit is broken anywhere or switch of the circuit is turned off, the current stops flowing.
The student is suffering from myopia or short- sightedness. The defect can be corrected by the use of concave (diverging) lens of an appropriate power.
The student is suffering from myopia or short- sightedness. The defect can be corrected by the use of concave (diverging) lens of an appropriate power.
What determines the rate at which energy is delivered by a current?
Electric power of a circuit determines the rate at which energy is delivered by a current.
Electric power of a circuit determines the rate at which energy is delivered by a current.
See lessWhy are coils of electric toasters and electric irons made of an alloy rather than a pure metal?
coils of electric toasters and electric irons are mode of an alloy (generally nichrome) due to the following two reasons: (i) Resistivity of an alloy is generally higher than that of pure metals, hence for a given resistance we need a coil of lesser length. (ii) At high temperatures, an alloy does nRead more
coils of electric toasters and electric irons are mode of an alloy (generally nichrome) due to the following two reasons:
See less(i) Resistivity of an alloy is generally higher than that of pure metals, hence for a given resistance we need a coil of lesser length.
(ii) At high temperatures, an alloy does not oxidise (burn) readily. Hence, coil of an alloy has longer life.
Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?
The current flows more easily through a thick wire as compared to a thin wire of the same material, when connected to the same source. It is due to the reason that resistance of a thick wire is less than that of a thin wire.
The current flows more easily through a thick wire as compared to a thin wire of the same material, when connected to the same source. It is due to the reason that resistance of a thick wire is less than that of a thin wire.
See lessOn what factors does the resistance of a conductor depend?
The resistance of a conductor depends on Length, Area of cross-section, Nature of the material of the conductor and Temperature of the conductor.
The resistance of a conductor depends on Length, Area of cross-section, Nature of the material of the conductor and Temperature of the conductor.
See lessName a device that helps to maintain a potential difference across a conductor.
Potential difference across a conductor can be maintained by means of a battery consisting of one or more cells.
Potential difference across a conductor can be maintained by means of a battery consisting of one or more cells.
See lessDefine the unit of current.
SI unit of electric current is ampere. Current is said to be 1 ampere (1A), if 1 coulomb charge flows per second across a cross-section of a conductor.
SI unit of electric current is ampere. Current is said to be 1 ampere (1A), if 1 coulomb charge flows per second across a cross-section of a conductor.
See lessWhat does an electric circuit mean?
An electric circuit is a continuous and closed path for flow of an electric current. If the electric circuit is complete, electric current can flow through the circuit. if the circuit is broken anywhere or switch of the circuit is turned off, the current stops flowing.
An electric circuit is a continuous and closed path for flow of an electric current. If the electric circuit is complete, electric current can flow through the circuit. if the circuit is broken anywhere or switch of the circuit is turned off, the current stops flowing.
See lessA student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?
The student is suffering from myopia or short- sightedness. The defect can be corrected by the use of concave (diverging) lens of an appropriate power.
The student is suffering from myopia or short- sightedness. The defect can be corrected by the use of concave (diverging) lens of an appropriate power.
See lessA person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?
A person with a myopic eye having the far point at 1.2 m should use a concave lens of focal length 1.2 m so as to restore proper vision.
A person with a myopic eye having the far point at 1.2 m should use a concave lens of focal length 1.2 m so as to restore proper vision.
See lessA ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
The light bends towards the normal on entry into water. It is due to the fact that as compared to air, the water is an optically denser medium.
The light bends towards the normal on entry into water. It is due to the fact that as compared to air, the water is an optically denser medium.
See less