Home 2nd Year Physics Notes Class 12 Physics Chapter 13 Notes – Current Electricity

# Class 12 Physics Chapter 13 Notes – Current Electricity

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In this post, I am sharing Class 12 Physics Chapter 13 Notes PDF for the students of Intermediate Part 2. This chapter’s name is Current Electricity. Students can download the Class 12 Physics Chapter 13 Notes PDF on their laptop or mobile. These Physics Notes are for all the boards working under the Punjab Board like Gujranwala Board, Lahore Board, Faisalabad Board, Multan Board, Rawalpindi Board, Sargodha Board, DG Kahn Board, and Sahiwal Board. Here are the complete FSC 2nd Year Physics Notes PDF chapters.

## FSC Part 2 Physics Chapter 13 Notes – Current Electricity

Class 12 Physics Notes

### Current Electricity

The branch of physics which deals with charges in motion is called current electricity or electrodynamics. e.g.,

(i) A light bulb glows to the flow of electric current.

(ii) The current that flows through the coil of motor that causes its shaft to rotate.

(iii) Most of the devices in the industry and our homes operate with current.

### Describe the source of current?

#### Source of Current

To have a constant current the potential fifference a cross the conductor should be mainteained constan. This is achieved by connecting the ends of wire to the terminals of a device called a source of current. The source of current which converts some non-electrical energy such as, chemical, mechanical, heat or solar energy into electrical energy is called source of current. There are many types of sources of currents. For example;

• Cells which converts chemical energy into electrical energy.

#### Types of Cells

(i) Primary Cells: Cells which cannot be recharged.

(ii) Secondary Cell: Cell which can recharge

• Electric generators which convert mechanical energy into electrical energy.
• Thermocouples which convert heat energy into electrical energy
• Solar energy converts sunlight directly into electrical energy.

### Resistivity and its Dependence upon temperature

It has been experimentally seen that the resistance R of a wire is directly proportional to its length L and inversely proportional to its cross-sectional area A.