Table of contents | |
Electric Charge | |
Electricity | |
Coulomb’s Law | |
Type of Materials | |
Conductance | |
Resistivity | |
Ohm’s law | |
Kirchhoff’s Law | |
Joule’s Law of Heating | |
Chemical Effect of Electric Current |
The electrostatic force of interaction acting between two stationary point charges is directly proportional to the product of magnitude of charges and inversely proportional to the square of the distance between them.
where, ε0 is called permittivity of free space.
Conductance and conductivity is the reciprocal of resistance and the resistivity of the material respectively. The SI unit of conductance is Ω−1 i.e., mho and to that of conductivity is Ω−1 m−1.
It states that if physical conditions of any conductor such as temperature, pressure etc., remain unchanged, then electric current (I) flowing through it is directly proportional to the potential difference (V ) applied across its ends, i.e.,
I ∝ V or V = IR
where, R is the electrical resistance of the conductor.
Emf of a Cell
This is known as Joule’s law of heating.
Electrical Power
The electrical energy produced or consumed per unit time is called electric power.
Electric power, P = VI = I2 R = V2/R
1 kWh = 3.6 × 106 J
It is the electric energy (called 1 unit).
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1. What is the concept of electric charge? |
2. What is Ohm's law and how is it related to electricity? |
3. How does Coulomb's law describe the interaction between electric charges? |
4. What is the significance of Kirchhoff's Law in electrical circuits? |
5. How does Joule's Law of Heating explain the heat generated in a resistor due to current flow? |
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