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Lab Notes: Week 4, Joule Heating and Newton's Law of Cooling, Physics 3LB at UCI

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Course
Basic Physics Laboratory (PHYSICS3LB)

Institution
University Of California - Irvine

Week 4 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 "Joule Heating and Newton's Law of Cooling."

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Uploaded on August 22, 2024
Number of pages 2
Written in 2019/2020
Type Other
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Wk 4: Joule Heating and Newton's Law of Cooling
Sunday, January 26, 2020 8:33 PM

• Rate of internal energy change(W)= mc*deltaT

○ Also equals mc ≃ mwcw + mrcr * dT/dt P = IV = V^2/R = I^2R
P = I2 R

○ w: water, r: resistor

• The electrical power P dissipated in a resistor is proportional to the voltage Temp->
Voltage

across the resistor V and the current flowing through the resistor I. Time

○ Power: rate of energy change

• Rate of heat transfer: Q = K (T - Troom)

○ T: water's temp, Troom : room temp.

• Expt setup: Monitor (computer+keyboard) -> Interface -> transducer

(thermocouple). Analogous signal from transducer is converted into digital

signal w/ monitor.

• Newton's Law of Cooling: temp decays exponentially over time.

• In this expt, we use a microcomputer as a transient digitizer and plot temp as a

function of time.

○ Transient digitizer: device that samples the voltage at regular time

intervals and stores that info.

○ Transducer converts temp (specifically changes its resistance to a

function of temp)into voltage -> PC plots said voltage.

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