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Lab Notes: Week 4, Joule Heating and Newton's Law of Cooling, Physics 3LB at UCI $2.99   Add to cart
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Lab Notes: Week 4, Joule Heating and Newton's Law of Cooling, Physics 3LB at UCI
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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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  • August 22, 2024
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  • 2019/2020
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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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