Circuits - Los Rios Community College Districtalmarazr/pages/PS301/Electricity_rta2b.pdf ·...
Transcript of Circuits - Los Rios Community College Districtalmarazr/pages/PS301/Electricity_rta2b.pdf ·...
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PS 301
Circuits
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Electric Potential (voltage)
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E-field vs M-field
+ & - charges N- & S- poles
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Circuits—Voltage Sources
Electric potential difference (continued)Example: water from a higher reservoir to a lower one—flow
continues until no difference
– no flow of charge occurs when potential difference is zero
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Resistance
Electric potential difference (continued)• Water and electric circuits compared
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Electric Circuits
Devices connect to a circuit in one of two ways:
• Series • Parallel
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Circuits in Series
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Circuits in Parallel
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Series
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Today ::: Ohm’s LawOhm’s Law
relationship between current, voltage, and resistance
Current in a circuit varies in direct proportion to the potential difference (voltage) and inversely with the resistance:
I
V R
R, for Solving
resistance
voltage current
V
I
Slope = V = R
I
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Today
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Measurements of voltage, current and resistance
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