Electrical Principles I Pdf notes KNEC

ELECTRICAL PRINCIPLES I

1. Direct Current Circuits

• Basic electrical quantities and their units
• Simple circuit diagrams
• Ohm’s law
• Determination of resistance of metal conductors
• Kirchoff’s laws
• Effects of temperature on resistance

2. Chemical Cells

• Faraday’s law of electrolysis
• Construction of cells and their characteristics
• Cell connections
• Charging methods
• Care and maintenance of cells
• Effects of internal resistance on terminal voltage

3. Electrostatics

• Electric fields
• Construction of capacitors
• Definitions of electrostatics quantities and units
• Determination of total capacitance
• Energy stored in a capacitors

4. Magnetism and Electromagnetism

• Magnetic and non-magnetic materials
• Magnetic field patterns
• Force on current carrying conductor
• Magnetism curve and hysteresis loop
• Electromagnetic induction
• Induction in materials

5. Transformers

• Principle of operation of transformers
• Types of transformers and their application
• Construction of different types of transformers
• Simple calculation on single phase transformers
• Transformer impendance matching
• Reasons for RF shielding