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You can find the resistance of a resistor by applying a known voltage across it and then measuring the current through it. By Ohm's law, resistance is voltage divided by current. You need to be careful to not pass too much current through the resistor, because any significant power will cause heat which will bias the results.
Resistors are also color coded with resistance and tolerance bands. Color charts are available on the internet. They can also be measured with a VOM.
Wiki User
∙ 13y ago
Wiki User
∙ 15y agoUsing an electronic box of tricks (a multimeter) which applies a fixed voltage to the ends of the wire and measures the current flow. From the formula resistance = voltage/current it can display the resistance. If you have to do the meaurement without the benefit of a multimeter you will have to do the same thing with a dry battery and an ammeter.
Wiki User
∙ 13y agoThrough ohm's law.
R=V/I.
Measure voltage applied (V) using voltmeter and current passing through it (I) using ammeter. Substitute in ohm's law R=V/I.
Resistance charts for various lengths, materials, and gauges of wire are available online and in scientific books. See related links (below) for one example. A 14-gauge copper wire commonly used in lighting circuits has about 2.5 ohms per 1000 feet, for example.
Wiki User
∙ 14y agoCurrent = Voltage / Resistance
Rearranging this would yield:
Resistance = Voltage / Current or R = V/I
Wiki User
∙ 14y agoIdfk
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Equation for Resistor serial and parallel?
In series, you just add the resistor values together to find the total resistance. In parallel you can use the following equation you can find the total resistance by multiplying the lowest and highest resistor value, the dividing that by the sum of all the resistor values you have in parallel. you could also take the inverse of all the inverses of you resistor values added together.
What resistance must be connected in parallel to 6.0-ohm resistor to reduce the combined resistance to 15-ohm?
No such resistor exists. Any resistor placed in parallel with a 6.0 ohm resistor is going to reduce the combined resistance below 6.0 ohms.
What is a contact resistor?
A: I snot a resistor but rather an unwanted resistance on a contact
What does r mean in a resistor?
R stands for the resistance.
When a 1 ohm resistor and a 1 ohm resistor are connected in series what is their conbined resistance?
The combined resistance will be 2 Ohms.
Equation for Resistor serial and parallel?
In series, you just add the resistor values together to find the total resistance. In parallel you can use the following equation you can find the total resistance by multiplying the lowest and highest resistor value, the dividing that by the sum of all the resistor values you have in parallel. you could also take the inverse of all the inverses of you resistor values added together.
What is the difference between an ohmic resistor and a non-ohmic resistor?
A non-ohmic resistor doesn't have a constant resistance. A ohmic resistor has a constant resistance.
Is resistor measured in amps?
No, a resistor isn't measured at all. A resistor has a quality called "resistance" - and that value is measured. Resistance is measured in Ohms.
How do you find power generated in a resistor?
The power generated in a resistor is converted into heat. and that can be power which is converted into heat is the product of the voltage across the resistor and, current passing through the resistor. or the product of square of the current and the resistance offered by the resistor.
What does resistor perform?
A resistor's resistance is measured in ohms. The higher the resistance the less current will flow with a constant voltage applied across the resistor. In terms of Ohm's Law Voltage = Current x Resistance.
What resistance must be connected in parallel to 6.0-ohm resistor to reduce the combined resistance to 15-ohm?
No such resistor exists. Any resistor placed in parallel with a 6.0 ohm resistor is going to reduce the combined resistance below 6.0 ohms.
How do you find resistance when you have current and resistance total?
If you are looking for the resistance of each resistor in either a series circuit or a parallel circuit you must measure the current I and the voltage V for each resistor. Then calculate its resistance using Ohms Law R = V / I where I = current (Amps), V = voltage (Volts) and R= resistance (Ohms).
How do you determine shorted resistor?
A short circuit is an unexpected path of zero resistance between two nodes in a circuit. If you measure the resistance of a resistor, and find that is has zero ohms, but the resistor is supposed to be somthing else, such as 100 ohms, then you can conclude that the resistor is shorted. Keep in mind that the precision of the measurement might be critical. If the resistor is supposed to be 100 ohms, but you get zero ohms, then the answer is easy. If the resistor is 0.001 ohms, but you get zero ohms, then you have to consider the precision of the measurement, the resistance of the wires, etc.
What is the maximum allowable resistance of a 680ohms resistor?
This depends on the tolerance rating of the resistor. There's 1, 2, 5, 10% tolerances. For tighter tolerances, you pay a premium - you can get tolerances as close as .1%. This is defined by one of the bands on the resistor. For a 10% tolerance, the maximum resistance of a 680 ohm resistor could be 748 ohms.
Which one of the following equations could be used to calculate the power absorbed by a resistor?
p=I*I*R ,P=V*V/R;where I is the current passing through the resistor, and V is the voltage across resistor, and R is the Resistance of the resistor,
What is a contact resistor?
A: I snot a resistor but rather an unwanted resistance on a contact
What does r mean in a resistor?
R stands for the resistance.
