Parallel resistors.

Resistors connected in parallel provide less resistance than the resistance of either of the lowest value parallel resistor.

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Equal value parallel resistors are really easy to calculate. 2 equal value resistors connected in parallel will provide half the resistance of one of them. 3 equal value resistors connected in parallel will provide 1/3 of the resistance of one of them, and so on.

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The video below provides a number of demonstrations and multimeter measurement of equal value parallel resistors. Watch directly on YouTube by clicking the following link. Parallel resistor circuits lowering equivalent resistance demonstrations for learning electronics

More in depth parallel resistor study

The basic formula for calculating the equivalent resistance of resistors connected in parallel is…


Which says that you invert the value of all of the resistors by taking one and dividing it by the value of the resistor. Next, Add up the inverted resistor values. Then, take the number one, and divide it by the added up inverted resistance value. Remember that n, as in (1/Rn) used here, means to keep repeating the process shown until you run out of how ever many of that particular variable there are.

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