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Custom Resistors
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Home
Cross Reference
Technical Information
How To Buy
Contact Us
About Us
Custom Resistor
Riedon offers the best lead-time in the industry. Average lead-time is 4-5 weeks for wire wound resistors. 1-2 week premium delivery is also available!
Technical Calculator
Ohm's Law
Series/Parallel
Voltage Divider
RTD's
Wheatstone Bridge
RL, RC Filters
Ohm's Law
Enter Any Two Numbers
Press Calculate to find the others.
Power (P)
Watts
Voltage (V)
Volts
Current (I)
Amps
Resistance (R)
Ohms
Ohm's Law
V=IR
Joule's Law
P=VI
Ohm's Law describes the relationships
between Voltage, Current, and Resistance
through a resistor. It is the most
fundamental equation in electronics.
Joule's Law describes the amount of
power that is required to sustain a
certain current through a circuit.
Using these two equations, if we know any two values, we can determine the others.
Series/Parallel
Enter Values
Leave One Blank
RT
R1
R2
R3
R4
Find the equivalent resistance (RT)
of resistors in series, parallel, or a combination
Select Circuit Type
Series
Parallel
Triple Series
Triple Parallel
Series - Parallel
Series - Parallel - Parallel
If you get "No Solution" Result was a Negative Resistance.
Voltage Divider
RT - Total Ohms
Ohms
Voltage Dividers
Voltage Dividers are very useful for lowering voltages to use as inputs for control circuits. They are nice because the output voltages will track the input voltage very precisly.
The output voltages are determined by theratios of the resistors chosen.
Use this tab to find the best choice for your application. Fill in empty values, press Calculate.
Amps
Volts
Volts
Volts
Volts
Volts
Select Circuit
4 Resistors
3 Resistors
2 Resistors
RTD's
Temperature Coefficient
of Resistance ( TCR )
Certain resistance material undergo a large
change in resistance due to temperature changes.
These changes are controllable and repeatable
making it highly suitable for measuring
temperatures. RTD's are a case of this.
TCR is measured in parts per million per C
(ppm/C), i.e. a 1 ohm resistor will change in
value by 0.0045 ohms for every 1C change in
temperature for a 4500ppm/C wire.
Use this tab to calculate either the resistance
change or temperature change based on different
standard resistance material.
Use the Temperature tab to convert Farenheit to
Centigrade. Temperatures must be in C.
Enter Starting
Conditions
Enter One Ending
Condition
Starting Temp ( C )
Ending Temp ( C )
Starting Resistance (Ohms)
Ending Resistance (Ohms)
Select TCR
( ppm/C )
+2600: 42% Ni Iron
+3850: Platinum
+3900: Copper
+4500: Balco
+5000: 99.5% Nickel
+6000: 99.9% Nickel
Temperature Conversion
Enter Farenheit or Centigrade - click Convert
Farenheit ( F )
Centigrade ( C )
To
Wheatstone Bridge
V
Volts
R1
Ohms
R2
Ohms
R3
Ohms
R4
Ohms
Must choose R1, try 1000 Ohms to start
T0
C
Enter Temperature of 0 Volt Output
T1
C
Enter Temperature of Vout Output
V0
Volts
Vout
Volts
Enter Range of Output, i.e. 1, for 0 - 1V output
Select TCR
( ppm/C )
+2600: 42% Ni Iron
+3850: Platinum
+3900: Copper
+4500: Balco
+5000: 99.5% Nickel
+6000: 99.9% Nickel
Standard Circuit
RTD Circuit
RL, RC Filters
Select Circuit Type
Lowpass RL Circuit
Lowpass RC Circuit
Highpass RL Circuit
Highpass RC Circuit
Enter Any Two Numbers
Press Calculate to find the others.
Frequency(F
_{0}
)
Hz
Inductance(L)
mH
Resistance(R)
Ohms
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