Lecture 16

# Lecture 16 - PEP112 Spring 2008 Prof Svetlana Malinovskaya...

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PEP112 – Spring 2008 Prof. Svetlana Malinovskaya 9 March 2008 Fundamentals of Circuits

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Introduction • Our primary interest is with circuits in which the battery’s potential difference is unchanging and all the currents in the circuit are constant. Such circuits are called direct current (DC) circuits. We’ll consider alternating-current (AC) circuits, in which the potential difference oscillates sinusoidally, later.
Key Ideas of Electric Circuits ,, wire wire VV AL IR I LA ρ ΔΔ == = R It relates the current to the potential difference between the ends of the conductor Ohm’s Law.

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Resistors • Because the resistance of metals is very small, R<<1 Ω , a circuit made exclusively of copper wires would have enormous currents and would quickly deplete the battery. • It is useful to limit the current by using circuit elements that, although they are conductors, have a resistance significantly larger than the wires. Such devices are called resistors .
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Lecture 16 - PEP112 Spring 2008 Prof Svetlana Malinovskaya...

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