Ohms Law Triangle

If you ever need help in remembering the different equations for ohm s law and solving for each variable v i r you can use the triangle below.

Ohms law triangle. Ohm s law triangle is an easy way to remember the voltage current and resistance relationship. It serves as a trick to find any one of the three quantities given the other two are known. In the above ohm s law. 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.

Ohms law calculation example. Let s use the second ohm s law triangle in another example. If a voltage of 10 volts is placed across a 500 ohm resistor determine the amount of current that will flow. This ohm s law triangle graphic is also helpful to learn the formulas.

Ohm s law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Ohm s law magic triangle. 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. Introducing the constant of proportionality the resistance one arrives at the usual mathematical equation that describes this relationship.

The ohm s law equations work if you use v a and or if you use v ma and k. 1 ma 0 001 a 1 k 1000. 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. The protection relay at a power system requires 26 ma current for triggering purposes.

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. Using ohmmeter the resistance of relays is found to be 200 ohms. Just cover the unknown value and follow the graphic as in the yellow wheel examples above. Simple to use ohm s law calculator.

Just enter 2 known values and the calculator will solve for the others. Where i is the current through the conductor in units of amperes v is the voltage measured across the conductor in. As you can see from the triangle and the equations above voltage equals i times r current i equals v over r and resistance equals v over i. 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.

Find the status of the relay when the source voltage is 5 2 v. Ohms law triangle transposing the standard ohms law equation above will give us the following combinations of the same equation.