Lesson Notes By Weeks and Term - Senior Secondary School 1

SUBJECT: PHYSICS

CLASS:  SS 1

DATE:

TERM: 2nd TERM

REFERENCE BOOK

• New School Physics By M.W Anyakoha
• Senior Secondary School Physics By P.N Okeke

 
WEEK TEN

TOPIC: PRODUCTION OF CONTINUOUS ELECTRIC CURRENT

CONTENT

• Production of Continuous Current From Mechanical Energy.
• Production of Continuous Current From Chemical Energy 
• Production of Continuous Current From  Heat Energy 
• Production of Continuous Current from Solar Energy.

• Production of continuous energy from mechanical energy

When a force is applied at a prime mover, the prime mover drives the amature/ rotar. As the amature is rotating in the magnetic field system , the amature cuts the magnetic flux produce by the magnet. Hence E.M.F will be induced in the coil of the amature  

based on faraday’s law of electromagnetic induction.

The induced E.M.F can be supplied to an external load.

• Production of Continuous Current from  Chemical Energy

A cell consist of two dissimilar metals separated by solution of various acids or salt. The metal are known as the electrodes and the solutions are the electrolyte. The positive electrode is known as the anode. The negative electrode is the cathode.

A cell is a device for converting chemical energy into electrical energy.

EVALUATION

1. With the aid of a diagram, describe how continuous current can be generated from mechanical energy.
2. With the aid of a diagram, describe how continuous current can be generated from chemical energy.

• Production of Continuous Current from Heat Energy

The ends of two dissimilar metal joined are inserted in cold and hot water and a galvamometer to detect the flow of charges. Due to temperature difference at both end current will flow in the connection. The greater the difference in temperature between the hot and cold junction, the greater the current flow.

• Production of Continuous Current from Solar Energy

If solar energy is made to fall on a photo electric cell, solar energy will be converted to electric energy directly by photo electric effect.

EVALUATION

1. With the aid of a diagram, describe how continuous current can be generated from mechanical energy.
2. With the aid of a diagram, describe how continuous current can be generated from chemical energy.

Reading Assignment

New School Physics pg 75 - 77

WEEKEND ASSIGNMENT

1. Cell convert chemical energy into ________ energy A. mechanical B. electrical
2. solar D. atomic 
3. DC generator convert  A.   electric to mechanical energy   B. mechanical to electric energy C.   solar to electrical energy D.   none of the above
4. Thermocouple consist of two A.   similar metals B.   dissimilar metals    C.   alloys metals    D.   none of the above.
5. The feature that produces magnetic flux in a generator is ______ A.  Amature
6. magnet     C.  stator  D.   prime mover
7. Conversion of mechanical energy into electrical energy in a dc generator is base on what principle A.   moment     B.   faraday’s law of electromagnetic induction    C.  coulomb’s law      D. fundamental law of electrostatic.

THEORY

1. With the aid of a diagram, describe how mechanical energy is converted to electrical energy.
2. With the aid of a diagram, describe how heat energy is converted to electrical energy.