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Author Archives: admin

Atmospheric pressure:Definition,formula & applications

Atmospheric pressure is the weight of air per unit area.Its value varies with altitude.The value of  atmospheric pressure at sea level is 1.013 x105 N/m2    The Earth is surrounded by a cover of air called atmosphere. It extends to a few hundred kilometers above sea level. Just as certain sea creatures live at the bottom of ocean, we live at the ...

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Properties and applications of laser light

Properties of laser light are given in the list light of laser is highly monochromatic Its light is highly coherent laser light is highly directional  light of laser can be sharply focused Now we will discus in detail about characteristics of laser light Laser light is highly monochromatic Tungsten light spread over a continuous spectrum, gives no basis for comparison. ...

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Galvanometer and ammeter

Galvanometer and ammeter are both current measuring devices.The galvanometer is used to measure very small current while ammeter is used to measure very large current up to 10 A. Now! We study in detail about these two instruments and we will also see the difference between galvanometer and ammeter. What is galvanometer? It is an electrical device which is used to ...

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Difference between gravitational force and electrostatic force in tabular form

The basic difference between gravitational and electrostatic force is that:Gravitational force is the force by which earth attracts other objects by mass. It is a conservative force. While electrostatic force is the force of an object due to charge. It is also conservative force. These two forces belong to the four fundamental forces of nature. Now! We see the difference ...

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Types of radioisotopes and their examples

The stable and non-radioactive elements can also be changed into radioactive elements .Such artificially produced radioactive elements are called radioactive isotopes.Some Types of radioisotopes are Radioactive sodium carbon,phosphorous,Iodine,Gold. Nuclei which do not emit radiations naturally are called stable nuclei. In general, most of the nuclei with atomic number 1 to 82 are stable nuclei. While the elements whose atomic number is ...

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Difference between thermistor and thermocouple

Thermistor and thermocouple both can be used to measure temperature.Basic difference between thermistor and thermocouple is that “A thermistor can only be used at fairly moderate temperatures.A thermocouple is used to measure typically high temperatures.” Thermistor definition A thermistor is a type of  variable resistor that is temperature sensitive . How thermistor works? When its temperature coefficient is negative,the resistance changes ...

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What are four fundamental forces of nature?

There are four fundamental forces of nature:Gravitational force,electromagnetic force,strong nuclear force and weak nuclear force.List of 4 fundamental forces given below: Gravitation Electromagnetic Strong nuclear interaction Weak nuclear interaction The man has always desired to comprehend the complexity of nature in terms of as few elementary concepts as possible. Among its quest, in Feynman’s words,has been the one for “wheel ...

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Formula for ohm’s law with example and problems

Ohm’s law states that: “The current flowing through a conductor is directly proportional to the potential difference across its ends provided the physical state such as temperature etc. of the conductor remains constant.”Formula for ohm’s law is “V=IR”. Ohm describes mathematically how voltage,current and resistance in a circuit are related.It is used in the equivalent form depending on which quantity ...

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Relationship between voltage and current

Relationship between voltage and current is describe in equation of ohm’s law (V=IR).Voltage is the amount of energy per charge which is required to move electrons from one point to another,while current is the rate of flow of charges.Difference between voltage and current are given in the table below. What is voltage in electricity? “Voltage is the amount of energy ...

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Resistance definition in physics and electricity

What do you mean by resistance? “Resistance is the property of material that restricts the flow of electrons.”When there is current in a conductive material ,the free electrons move through the material and occasionally collide with atoms.These collisions cause the electrons to lose some of their energy,and thus their movement is restricted.This restriction varies and is determined  by the type ...

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