Download CIRCUITS AND CURRENT ELECTRICITY

Quarknet Intro.
• Teaching style
– Lecture & discussion
– Outline presentation
– Big Picture
• Student knowledge
Playground circuits
Slide rules
The ladder and single
slide
• Climbing the ladder
– Top Vs. Bottom?
– What is a “ladder?”
• Sliding down the slide
– Top Vs. Bottom?
– What is a “slide?”
• Total energy/potential
change(s)
Tall ladders and short
slides (and vice versa)
• Total energy/potential
changes
• Current
Slides in series
• Series?
• Current
• Total energy/potential
change(s)
• Energy/potential changes
per slide
Slides in parallel
• Parallel?
• Current
• Current at a node
• Potential and potential
energy changes
Parallel and series
combinations
• Rule reminders
– Total energy/potential changes
– Current at a node
– What is a “ladder?”
– What is a “slide?”
• Example
ELECTRIC CIRUITS VS.
PLAYGROUND CIRCUITS
• The same rules (no further
comment, let’s look at some
examples)
Batteries
• What is a battery?
• Potential difference
Resistors
• What is a resistor?
A Battery and a resistor
• Total energy/potential
change(s)
• “Big” batteries and small
resistors (and vice versa)
• Ohm’s law & Ohmic devices
Resistors in series
• Series?
• Current
• Equivalent resistance
• Total energy/potential
change(s)
• Energy/potential changes
per resistor
Resistors in parallel
• Parallel?
• Energy/potential changes
per resistor
• Current in each resistor
• Current at a node
• Equivalent resistance
Parallel and series
combinations
Batteries
• Internal resistance
–Ideal
–Real
Resistance in wires
• Factors affecting resistance
– Length
– Width
– Temperature
– material
Circuit
applications
• Voltage divider
– two resistors
– potentiometer
• Current divider (shunt)
Meters in circuits
• Ammeters
• Voltmeters
Conventional
current Vs.
charge flow
•Electron Vs. proton
flow