Lecture 17

# Lecture 17 - PEP112 Spring 2008 Prof. Svetlana Malinovskaya...

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PEP112 – Spring 2008 Prof. Svetlana Malinovskaya 12 March 2008 Resistors, RC-Circuits

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Which of the following are ohmic materials: A. Wires B. Resistors C. Light bulb filaments D. All of the above E. None of the above
Which of the following are ohmic materials: A. Wires B. Resistors C. Light bulb filaments D. All of the above E. None of the above

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Real Batteries • Let’s look how real batteries differ from ideal batteries. • Real batteries provide slight resistance to the charge transfer within the battery, which is called internal resistance. bat bat eq eq R bat V ideal VI r r e a l where I iscurrentin battery RR r I r R R Rr rR r ε εε Δ= =+ == + = + = = + +
A Short Circuit • When a connection of a very low or zero resistance is made between two points in a circuit, then we have what is called a short circuit. The wire is shorting out the battery. • A 3V battery with 1 Ω internal resistance generates a short circuit current of 3A. This is the maximum possible current that this battery can produce.

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## This note was uploaded on 04/09/2008 for the course PEP 112 taught by Professor Whittaker during the Spring '07 term at Stevens.

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Lecture 17 - PEP112 Spring 2008 Prof. Svetlana Malinovskaya...

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