How To Find Ohm Of Resistor

There are three steps for coding a 1kω resistor.

How to find ohm of resistor. A resistor that functions according to ohm s law is called an ohmic resistor. Calculate power current voltage or resistance. Identify the first and second significant figures. Our ohms law calculator is a straightforward tool that utilizes simple ohm s law formula to find out voltage v resistance r.

Find the value of unknown resistor which drops 5 v when 20 ma current is flowing through it. Just use the nearest one you can easily find. Basic resistor values range from 0 1 ohm to 10 megaohms. In the resistor shown in the preceding figure the two digit number is 47 and the multiplier is 10 so the nominal value is an easy way to multiply a whole number by a power of 10 that is 10 0 10 1 10 2 10 3 and so on is to just append meaning tack on to the end the whole number with zeros and use the exponent which is the small raised number next to the 10 to tell you how.

Find the voltage drop for the 60 ohm resistor with e i x r or e 2 x 60 120v drop across the 60 ohm resistor. To learn more about this magic formula read about ohms law. Position the resistor with this band on the right side and again read your resistor from left to right. Mine isn t bad at the present time but i want one for a spare in case of being out on the rd.

The following are tools to calculate the ohm value and tolerance based on resistor color codes the total resistance of a group of resistors in parallel or in series and the resistance of a conductor based on size and conductivity. When current passes through an ohmic resistor the voltage drop across the terminals is proportionally to the magnitude of resistance. We re dividing the current by 1000 because our listing in in miliaps or 1 1000 th of an amp. Ohm s formula stays also valid for circuits with varying voltage or current so it can be used for ac circuits as well.

1 1 30 1 30 15. Find the circuit current by i e r or i 150 75 2 amps. The total resistance appears as 75 ohms to the 150v source. I have looked online.

Simple to use ohm s law calculator. So a 1k ω resistor has a value of 1 000 ohms and the number we will code is 1 000. Just enter 2 known values and the calculator will solve for the others. Resistance r voltage v current i.

The two parallel 30 ohm resistors have an equivalent resistance of 15 ohms.