Ohm S Law Triangle

Using ohmmeter the resistance of relays is found to be 200 ohms.

Ohm s law triangle. Let s use the second ohm s law triangle in another example. Ohm s law triangle is an easy way to remember the voltage current and resistance relationship. Ohms law calculation example. Ohm s law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

Just cover the unknown value and follow the graphic as in the yellow wheel examples above. In this way the current is found by dividing the voltage by the resistance. Then by using ohms law we can see that a voltage of 1v applied to a resistor of 1ω will cause a current of 1a to flow and the greater the resistance value the less current that will flow for a given applied voltage. For most electronic circuits the amp is too large and the ohm is too small so we often measure current in milliamps ma and resistance in kilohms k.

If a voltage of 10 volts is placed across a 500 ohm resistor determine the amount of current that will flow. Ohm s law magic triangle. The protection relay at a power system requires 26 ma current for triggering purposes. Calculate power current voltage or resistance.

Looking at the ohms law triangle the current is the unknown leaving the voltage and resistance as the known values. It serves as a trick to find any one of the three quantities given the other two are known. Where i is the current through the conductor in units of amperes v is the voltage measured across the conductor in. 1 ma 0 001 a 1 k 1000.

The ohm s law equations work if you use v a and or if you use v ma and k. The tool for measuring volts in an electric circuit is called a voltmeter. Find the status of the relay when the source voltage is 5 2 v. This ohm s law triangle graphic is also helpful to learn the formulas.

Introducing the constant of proportionality the resistance one arrives at the usual mathematical equation that describes this relationship. You ll have to insert the x between the i and r in the graphic and imagine the horizontal divide line but the principal is just the same. A multimeter can measure several functions including voltage current resistance and temperature. If the value of voltage is asked and the values of the current and resistance are given then to calculate voltage simply cover v at the top.

Ohms law triangle transposing the standard ohms law equation above will give us the following combinations of the same equation. You can make use of the ohm s law magic triangle to remember the different equations for ohm s law used to solve for different variables v i r. The concept behind ohm s law was first explained by german physicist georg ohm who the law is also named after.