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Example. Heat of 50 watts develops in a resistor when the currentis
1.5 amp. Calculate the resistance.
Keys:
Display:
B@(soLve] {R}
P?value
50
I ?value
1.5
R=222222
Description:
Selects R, prompts for
P.
Stores P, prompts for I.
Stores I, calculates R.
Ideal Gas Law
The Ideal Gas Law describes the relationship between pressure, vol-
ume, temperature, and amount of an ideal gas:
where
PXU=NXRXT
N =
the number of moles of gas.
P =
the pressure (in atmospheres or N/m?).
R =
the gas law constant (0.0821 liter-atm./mole-K or
8.314 J/mole-K).
T =
the temperature, in Kelvins (K = °C + 273.1).
V =
the volume, in liters.
Example: Pressure of a Gas. A 2-liter bottle contains 0.005 moles
of carbon dioxide gas at 24°C. Assuming that the gas behaves as an
ideal gas, calculate its pressure.
Keys:
Display:
B(soLve] {P}
v2value
2
N?value
.005
R?value
100
7: The Equation Library
Description:
Selects P, prompts for
V.
Stores V, prompts for
N.
Stores N, prompts for
R.
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