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Electricity
Electric potential: The Electric potential of a point in an electric field is defined as the work
to be done to move a unit positive charge from infinity to that point
...
The distribution of charge in a body is measured in coulombs
...
Following is the relation between charge on the body (Q), number of electrons (n) and
charge on an electron (e)
Q = ne
The SI unit of electric charge is coulomb, denoted by the letter ‘C’
...
The SI unit of current (I) is taken as ampere
...
The bulb will glow or the magnetic needle will show deflection if the liquid in the beaker is a
good conductor of electricity
...
Good conductor
Lemon Juice
Poor conductor
Coal tar
Vinegar
Acid solutions
Basic solutions
Salty water ( Tap water, sea
water
Distilled water
Honey
Vegetable oil
Kerosene
Conducting liquids are also called electrolytes
...
causes chemical
Ohm’ law: Under constant physical conditions
, the current flowing through a conductor is
directly proportional to the potential difference across the conductor
...
In conductors, flow of electrons constitute current
...
The negative terminal of a battery is said to be at lower potential
and the positive terminal is said to be at higher potential
...
...
Unit (ρ) → Ω-m
...
Both the resistivity and the resistance of a material vary with temperature
...
Greater the deflection of needle or brighter the light, better is the conductivity of the liquid
...
The electric current passing through a conducting liquid
reactions
...
+R n
Resistance in parallel connection
Joule’s heating law suggests that heat produced in a resistor is directly proportional to the
1
...
e
...
resistance of the resistor i
...
, H R
3
...
e
...
Electroplating is the process of coating a metal using electric current and electrolyte
...
Electroplating can be used to give shiny and scratch proof finish
to
objects made from cheaper metals
...
Electric power: Electric power is defined as the rate of consumption of energy or simply
the rate of doing work
...
1 Unit – 1 kWh = 3
Description: best notes which can help you a lot in your studies.