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Lab Notes: Week 3, Meter and Ohm's Law, Physics 3LB at UCI $2.99   Add to cart
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Lab Notes: Week 3, Meter and Ohm's Law, Physics 3LB at UCI
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Week 3 notes of Physics 3LB lab at University of California, Irvine. Notes are based on the course's lab manual and are intended to help you understand the theory of "Meter and Ohm's Law."

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  • August 22, 2024
  • 3
  • 2019/2020
  • Other
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Week 3: Meter and Ohm's Law
Monday, January 20, 2020 2:49 PM


Va

• Ohm's Law: voltage V is linearly proportionate to the current that flows thru the


material. (V = IR)
Vb

• Circuits contain more than one resistor: either connected in parallel or in series.


○ Resistors used to either INC or DEC the amount of current that flows thru the


circuit.


○ Parallel resistors allow more current to flow thru the circuit. (Ieq =


I1+I2+I3+…)


○ Series resistors allows less current to flow thru b/c the current path now


passes 2 resistors.


• Voltmeter: measures voltage by measuring the small amount of current that flows


thru the internal resistor.


○ Ri : internal resistance of the voltmeter. (For reading to be accurate)Ideally

IDEALS for meters.
much larger than R (Ri > R1).



○ Voltmeter is placed in parallel w/ the resistor. -> Ri and R are connected in



parallel circuits.


• Ammeter: measures current by detecting the voltage that appears across the


internal resistor of the ammeter. Just a wire…

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