ELECTRICITY PPT COMPILED & EDITED BY MUKESH KUMAR CHHIPA TGT WE K V 2 AJMER (RAJ.) (M)

Electricity Theory VIR PIV and Capacitors!!!

Energy  When an object is at some height in a gravitational field it is said to have gravitational potential energy, PE g PE g

Potential Difference

 Back to the zero point  A convenient zero point to chose in a circuit or any electric system is the “ground”

Battery (cells)  A battery produces electricity by transforming chemical energy into electrical energy

Battery Carbon Electrode Zinc Electrode Sulfuric Acid +

Capacitor  A capacitor is a storehouse of charge and energy that can be reclaimed when needed for a specific application  A capacitor will only charge to the potential difference between the terminals of the battery

Capacitance  Capacitance, C: The ability of a conductor to store energy in the form of electrically separated charges  Capacitance is the ratio of charge to potential difference

Charge Movement

Circuit Analogy

Types of Current  AC  Alternating current  charges continuously change direction forward and back at 60 Hz  Example: outlets (approx 120 V)  DC  Direct current  charges move in one direction  Example: batteries AC-DC Debate births the Electric Chair

Resistance  Resistance is the impedance of the motion of charge through a conductor  The ratio of potential difference across a conductor to the current it carries

Ohm’s Law

Resistance  Depends on: Length, cross sectional area, material, and temperature

Resistance and Temp

Resistance and Thickness

Resistor  An electronic element that provides a specified resistance.  A current or voltage REGULATOR

Power (it’s Electric!)  Power: Rate at which work is done. OR Rate at which energy is transformed  Electric Power: The rate at which charge carriers convert PE E into non-mechanical energy

Reading and Homework  Read Chapter 17 pp  HW due on test day: p ; p 601 2, 3, 5-9; p – 4 (B); p609 1 – 5 p – 6; p , 7,9 p – 5  Extra Practice p 626 – , 20 – 54