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Reminders: Exam I coming up Mon Feb 24 th ! (a week from Monday)PowerPoint Presentation

Reminders: Exam I coming up Mon Feb 24 th ! (a week from Monday)

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### Reminders:Exam I coming up MonFeb 24th!(a week from Monday)

HW3 due on Fri Feb 21

+

+

Will provide whatever current is needed.

Always maintains a fixed electric potential

across it’s terminals.

Batteries hooked in series:

Batteries hooked in parallel:

We’ll always assume conventional current flow:

A current of positive charge moving from + to −.

The real current (electrons) going backward is

completely equivalent (for our purposes!)

Units?

Example 18-1: A current of 1.30 A flows in a wire. How many electrons are flowing past any point in the wire per second?

Example: 18.7 An electric clothes dryer has a heating element with a resistance of 9.6 . (a) What’s the current in the element when connected to 240 V? (b) How much charge passes through the element in 50 min?

A perfect wire has zero resistance (negligible resistance compared to other stuff)

So, no potential drop along wire

That is …. (for example)

A perfect wire has zero resistance (negligible resistance to other stuff)

So, no potential drop along wire

Whatever V is here …

A perfect wire has zero resistance (negligible resistance to other stuff)

So, no potential drop along wire

Whatever V is here …

It’s the same here!

No matter what current is flowing!

Points at the same electric potential….

Every point of the same color is at the same potential!

Small ‘resistance’

Resistance: depends on the object’s size, shape, and composition.

Resistivity: depends ONLY on the object’s composition.

Example: 18.13 What is the resistance of a 3.5 m length of copper wire 1.5 mm in diameter?

Example: Now, how much current will flow in that wire if it’s hooked up to a 1.5 V battery?

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