Example: Conversion with Vectors.

Engineer P.C. Bard has determined that in the RC circuit shown, the total impedance is 77.8 ohms and voltage lags current by 36.5 º. What a .re the values of resistance R and capacitive reactance XC in the circuit?

Use a vector diagram as shown, with impedance equal to the polar magnitude, r, and voltage lag equal to the angle, θ, in degrees. When the values are converted to rectangular coordinates, the x–value yields R, in ohms; the y–value yields XC ,in ohms.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

 

 

 

 

 

 

 

 

 

 

θ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

_36.5o

 

R

X c

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

77.8 ohms

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Keys:

Display:

Description:

zŸ{}



Sets Degrees mode.

36.5 _š . )Enters θ, degrees of voltage lag.

77.8

) _

Enters r, ohms of total impedance.

{r

)Calculates x, ohms resistance, R.

Z

. )Displays y, ohms reactance, XC.

For more sophisticated operations with vectors (addition, subtraction, cross product, and dot product), refer to the "Vector Operations" program in chapter 15, "Mathematics Programs"

Time Conversions

Values for time (in hours, H) or angles (in degrees, D) can be converted between a decimal–fraction form (H.h or D.d) and a minutes–seconds form (H.MMSSss or D.MMSSss) using the zsor {tkeys.

Real–Number Functions 4–9

File name 32sii-Manual-E-0424

 

Printed Date : 2003/4/24

Size : 17.7 x 25.2 cm