# Basic Electronics

Jun 17th, 2015
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Resistor is a component used to control the size of the current that flows in an electronic or electric circuit. The size of the current that flows through a conductor depends on its resistance. The greater the resistance, the smaller is the current.Resistance: It is the property of a conductor due to which it poses an obstruction to the flow of current through it.

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AIM TO SET UP A CIRCUIT FOR A POLICE SIREN.COMPONENTS USED1. I.C. (Integrated Circuit) TwoIC1 555IC2 5552. Resistors SixR1 10 KWR2 100 KWR3 2.7 KWR4 4.7 KWR5 4.7 KWR6 4.7 KW3. Diode OneD1 IN400Z4. PNP-Transistor OneT1 BC1675. Capacitances ThreeC1 10 mFC2 0.1 mFC3 47 mF6. Speaker OneSPKR - 8WCOMPONENT DESCRIPTIONRESISTORResistor is a component used to control the size of the current that flows in an electronic or electric circuit. The size of the current that flows through a conductor depends on its resistance. The greater the resistance, the smaller is the current.Resistance:It is the property of a conductor due to which it poses an obstruction to the flow of current through it.Definition:Resistance of a conductor is defined as the ratio of potential difference (v) across the ends of the conductor to the current flowing through it. i.e. R = V/IWhere, 1ohm = 1 volt = 1V1 ampere 1AThus, one ohm is the resistance of the conductor through which a current of 1 ampere flows when a potential difference of 1 volt is applied across the ends of the conductor.SI UNIT : Ohm (W).DIMSENSIONS: [M1 L T-3 A 2 ].Cause of resistance of a conductor:Resistance of a given conducting wire is due to the collisions of free electrons with the ions or atoms of the conductor while drifting towards the positive end of the conductorR = r L ___(1)Thus from equation (1) we get that resistance of a material is1. Directly

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