Resistors in Series or Parallel

Source: HP-33E Student Engineering Applications, 1978

Original Calculator: HP-33S

Credit to Hewlett Packard Company

Ported to HP 35S by Eddie Shore, 10/10/2013

Instructions:

1. For each group of parallel or series resistors: press XEQ R.

2. At the Mode Prompt (INPUT M), enter 0 R/S for Parallel Resistors, 1 R/S for Series Resistors

3. Enter resistor values (assumed to be in Ohms) then press R/S.

4. To find the total, press XEQ R016.

5. Optional: Store the result in a variable for future use, as long is it not R.

Parallel Resistors: total resistance = 1/( 1/R1 + 1/R2 + ... )

Series Resistors: total resistance = R1 + R2 + ...

Program:

R001 LBL R

R002 0

R003 STO R

R004 SF 10 // press Left Shift, Flags, SF, decimal point, 0

R005 0=PAR 1=SER // equation

R006 PSE

R007 CF 10 // press Left Shift, Flags, CF, decimal point, 0

R008 INPUT M

R009 R/S

R010 RCL M

R011 x=0?

R012 XEQ R024

R013 R-down

R014 STO+ R

R015 GTO R009

R016 RCL R // total resistance

R017 RCL M

R018 x=0?

R019 XEQ R024

R020 CLx

R021 STO M

R022 R-down

R023 RTN

R024 R-down

R025 1/x

R026 ENTER

R027 RTN

Source: HP-33E Student Engineering Applications, 1978

Original Calculator: HP-33S

Credit to Hewlett Packard Company

Ported to HP 35S by Eddie Shore, 10/10/2013

Instructions:

1. For each group of parallel or series resistors: press XEQ R.

2. At the Mode Prompt (INPUT M), enter 0 R/S for Parallel Resistors, 1 R/S for Series Resistors

3. Enter resistor values (assumed to be in Ohms) then press R/S.

4. To find the total, press XEQ R016.

5. Optional: Store the result in a variable for future use, as long is it not R.

Parallel Resistors: total resistance = 1/( 1/R1 + 1/R2 + ... )

Series Resistors: total resistance = R1 + R2 + ...

Program:

R001 LBL R

R002 0

R003 STO R

R004 SF 10 // press Left Shift, Flags, SF, decimal point, 0

R005 0=PAR 1=SER // equation

R006 PSE

R007 CF 10 // press Left Shift, Flags, CF, decimal point, 0

R008 INPUT M

R009 R/S

R010 RCL M

R011 x=0?

R012 XEQ R024

R013 R-down

R014 STO+ R

R015 GTO R009

R016 RCL R // total resistance

R017 RCL M

R018 x=0?

R019 XEQ R024

R020 CLx

R021 STO M

R022 R-down

R023 RTN

R024 R-down

R025 1/x

R026 ENTER

R027 RTN

Example 1:

Keystrokes:

1st Set:

XEQ R ENTER

0 R/S

120 R/S

240 R/S

120 R/S

XEQ R016

STO T

2nd Set:

XEQ R ENTER

0 R/S

320 R/S

400 R/S

XEQ R016

STO U

RCL+ T

Total Resistance: 225 7/9 ohms

Keystrokes:

1st Set:

XEQ R ENTER

0 R/S

120 R/S

240 R/S

120 R/S

XEQ R016

STO T

2nd Set:

XEQ R ENTER

0 R/S

320 R/S

400 R/S

XEQ R016

STO U

RCL+ T

Total Resistance: 225 7/9 ohms

Example 2:

XEQ R ENTER

0 R/S

30 R/S

60 R/S

XEQ R016 // Result: 20

STO T

XEQ R ENTER

1 R/S

RCL T R/S

80 R/S

XEQ R016 // Result: 100

STO T

XEQ R ENTER

0 R/S

RCL T R/S

40 R/S

XEQ R016

Total Resistance: 28 4/7 ohms

XEQ R ENTER

0 R/S

30 R/S

60 R/S

XEQ R016 // Result: 20

STO T

XEQ R ENTER

1 R/S

RCL T R/S

80 R/S

XEQ R016 // Result: 100

STO T

XEQ R ENTER

0 R/S

RCL T R/S

40 R/S

XEQ R016

Total Resistance: 28 4/7 ohms

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