HP -225 Owner's Manual page 116

5 Y=2.3608 Stores T, calculates Y.
Part 2: What applied voltage is required in order to attain 4 V across
the capacitor after 5 seconds? (Solve for F—the voltage applied to the
circuit and the final voltage across the capacitor.)
B(soLve] {F} ¥Y?2.3608 Selects F, prompts for
Y.
4 170.0000 Retains previous I, K,
K?-0.1000 and T, calculates F.
T?5.0000
F=18.16608
Root Mean Square
The following equation uses the statistics registers to calculate the root
mean square, or quadratic mean, of a set of numbers:
R=SART(Zx2+n>
where R = the root mean square.
Example: Calculate the root mean square of the data 3, 4, 5, 6, 6,
7, 9.
Keys: Display: Description:
B(CLEAR] {2} Clears the statistics
registers.
3 4 Enters the statistics
5 6 data.
6 7
9 n=7.0000
If necessary, make the root mean square equation the present equa-
tion. Then:
R=6.0000 Calculates the root
mean square.
108 7: The Equation Library