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Transcript 
CIRCUITS AND
CURRENT ELECTRICITY
What do resistors do?
Resistance in wires
• Factors affecting resistance
– Length
– Width
– Temperature
– material
Mechanical and
electrical circuits
• Energy source & conversion
– Ladder
– Battery
• Current
– Students
– charges
Mechanical and
electrical circuits
• Resistance and energy
“loss”
– Slide
– resistor
• Ohmic devices
• Power dissipation
Mechanical and
electrical circuits
• Series
• Parallel
• Combination circuits
Circuit
applications
• Voltage divider
– two resistors
– potentiometer
• Current divider (shunt)
Meters in circuits
• Ammeters
• Voltmeters
Batteries
• Internal resistance
–Ideal
–Real
Conventional
current Vs.
charge flow
•Electron Vs. proton
flow
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