## Unit-2 Current Electricity

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Goals of study *By studying this chapter, you will learn:*

• The meaning of electric current, and how charges move in a conductor.

• What is meant by the resistivity and conductivity of a substance.

• How to calculate the resistance of a conductor from its dimensions and its resistivity.

• How an electromotive force (emf) makes it possible for current to flow in a circuit.

• How to do calculations involving energy and power in circuits.

• How to analyze circuits with multiple resistors in series or parallel.

• Rules that you can apply to any circuit with more than one loop.

• How to use meter bridge and potentiometer in a circuit.

• The meaning of electric current, and how charges move in a conductor.

• What is meant by the resistivity and conductivity of a substance.

• How to calculate the resistance of a conductor from its dimensions and its resistivity.

• How an electromotive force (emf) makes it possible for current to flow in a circuit.

• How to do calculations involving energy and power in circuits.

• How to analyze circuits with multiple resistors in series or parallel.

• Rules that you can apply to any circuit with more than one loop.

• How to use meter bridge and potentiometer in a circuit.

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**Chapter-1 ****[Download pdf]**

**[Download pdf]**

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**List of topics covered **

- Electric Current its cause in Metals/ Flow of electrons in the conductors
- Drift Velocity, Relaxation time,Free Path (Derivation)
- Current Density
- Current Density in terms of Drift Velocity
- Relation between Current and Drift velocity
- Relation between current density and Relaxation time
- Important points about current density and expressions for conductivity and resistivity
- Definition of conductivity, Resistivity and Mobility
- Ohm’s Law
- Temperature dependence of Resistivity and resistance of metals
- Temperature Coefficient of Resistivity/Resistance
- Thermistor
- Battery, Electromotive Force (EMF), Terminal Potential Difference, Internal Resistance of a cell

**Chapter-2**

**[Download pdf]**

**List of topics covered**

- Factors on which internal resistance depends, terminal potential difference and EMF depends
- Relation between terminal potential difference, EMF and internal resistance of a cell
- Color code of Resistance
- Resistance in Parallel and series
- Kirchhoff's laws
- Grouping of Cells, series and parallel
- Mixed grouping of cells
- Wheat stone Bridge
- Measurement of unknown Resistance by using Wheat Stone Bridge
- Meter Bridge
- Potentiometer and its applications
- Thermal effects of current
- Power consumed by group of Resistances
- Power Rating
- Efficiency of source of emf
- Power Transmission

Current Electricity - Study Material CBSE IITJEE NEET
Reviewed by Dr H. Singh
on
March 25, 2020
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