Lecture-7-02-05-08 - Lecture-7 Electric current and Ohm's...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 pum High Low Lecture-7 Electric current and Ohm’s Law Electrical Circuits An electrical circuit is a closed-loop assembly of sources of charge, conductors, resistors, capacitors and other units of electrical elements to sustain electrical current. A source of charge as a seat of emf ( ε ) sets up potential difference within circuit and drives current; examples are battery, generator, solar cell, fuel cell, etc. By Ohm’s law, current of electrical charge is maintained through a resistor; the role of seat of emf is to raise the potential of a piece of charge going through it from one terminal to another. This is analogous to pumping water to a reservoir at higher elevation to sustain water flow in network of pipes. Electric potential decreases as charge travels through resistor, much like plumbing.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 V = V 1 + V 2 + V 3 = I ( R 1 +R 2 +R 3 ) R total = R 1 + R 2 + R 3 I = I 1 +I 2 + I 3 V = I 1 R 1 = I 2 R 2 =I 3 R 3 I =V ( R 1 +R 2 + R 3 ) -1 3 2 1 1 1 1 1 R R R R total
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/20/2008 for the course PHYSIC 2 taught by Professor Kim during the Spring '08 term at Lehigh University .

Page1 / 7

Lecture-7-02-05-08 - Lecture-7 Electric current and Ohm's...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online