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مقدمه ای بر الکتریسیته بخش چهارم

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Ohm’s Law

Electric Circuit A simple electric circuit consists of a voltage source, some

type of load, and conductors to allow electrons to flow between

the voltage source and the load.

Ohm’s law shows that current varies directly with voltage and

inversely with resistance.

Current (I) is measured in amperes (amps)

Voltage (E) is measured in volts

Resistance (R) is measured in ohms

Law Triangle

There is an easy way to remember which formula to use. By

arranging current, voltage and resistance in a triangle, you can

quickly determine the correct formula.

To use the triangle, cover the value you want to calculate. The

remaining letters make up the formula.

Ohm’s Law Example As the following simple example shows, if any two values are

known, you can determine the other value using Ohm’s law.

Using a similar circuit, but with a current of 200 mA and a

resistance of 10 W. To solve for voltage, cover the E in the

triangle and use the resulting equation.

Remember to use the correct decimal equivalent when dealing

with numbers that are preceded with milli (m), micro (m), kilo (k)

or mega (M). In this example, current was converted to 0.2 A,

because 200 mA is 200 x 10-3 A, which is equal to 0.2 A.

 


نوشته شده در : یکشنبه 19 آذر 1391  توسط : جواد خانی.    نظرات() .

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