Electronics Principles V11

Clive W. Humphris

OHM'S LAW: Current.  

A simple DC circuit consists of a current source (the battery) connected across a resistor. Electrons are propelled by the electromotive force (voltage) of the battery. Expelled from the negative terminal (-) and attracted by the positive (+) terminal.

Using Ohm's Law the circuit voltage, current or resistance can be found. An easy way of remembering each of the formulae is to draw a triangle as shown. Covering the result variable in the triangle leaves the required formula.

The graph shows a linear relationship between V, I and R, i.e. an increase in the voltage across the resistor causes a proportional increase in the current through the resistor.

The plot Window shows an accurate representation for your chosen values.

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