Facts about Resistors

Facts about Resistors

Posted by Admin / in Science Facts

Resistors are one of the building blocks of electronic circuits

Facts about Electrical Resistors

  • A resistor is an electrical component thats main purpose is to resist electricity.

  • Resistors limit the flow of current through a circuit.

  • A major use of resistors in circuit design is: using standard power sources, limiting the current is important to protect electronic components that might burn out at higher currents

  • The value of a resistor is measured in Ohm's, named after the German scientists Georg Simon Ohm.

  • Ohm's Law states that for an ideal resistor, the resistance in a circuit is equal to the voltage divided by the current or I = V x R.

  • The actual value of a resistor is easily measured using an ohmmeter or multimeter.

  • Most standard resistors use a mixture of carbon and a binder to control the amount of electrical current resistance. This type of resistor is known as carbon composition resistor. A resistor with higher higher carbon and less binder has less resistance.

  • The second type of widely used resistors is known as the metal film resistor. This type of resistor uses a thin metal film as an electricity conductor. The type of metal and additives to the metal change the resistance.

  • Other types of electricity resistors, designed for circuits include photoresistors, carbon-film resistors, variable resistors (potentiometers), wire-round resistors, and photoresistors.

  • A standard resistor has two leads (legs), known as an axial lead. Connection of a resistor in a circuit is possible in either direction. The resisting value is still the same in either direction.

  • All electronic components resist electricity. Electrical engineers must take in account the resistance of all the components in a circuit. Manufactured electrical components typically have a data sheet that reports the resistance of the part. To experiment and test for electrical resistance on your own try the Electrical Resistor Experiment.

Resistor Use in a Circuit

  • The total resistance of any number of resistors in series (in a row) is calculated by adding the resistor values.

  • The total resistance of any number of resistors in parallel is calculated by multiplying all of the resistors then dividing by the sum of all their values.

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    posted by Allen Douglas - Allen is a profession engineer, achieving a Master of Science in Engineering. He has taught at the university level, but enjoys helping younger students to learn about math and science. Mr. Douglas has been writing technical papers for over 20 years, and writing online articles since 2008.