Current-Voltage Relationships (HSC SSCE Physics): Flashcards

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Current-Voltage Relationships
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Three conditions for electric current to flow

Free charge carriers, conducting path, driving force

Formula for potential difference (V)

V=WqV = \frac{W}{q}

Unit of potential difference

Volt (V)

How to connect a voltmeter

In parallel across the component

Formula for resistance (R)

R=VIR = \frac{V}{I}

Unit of resistance

Ohm (Ω)

Define ohmic components

Components with constant resistance over wide voltage range

Define non-ohmic components

Components with resistance varying with applied voltage

I-V graph shape for ohmic components

Straight line through the origin

Low current at given voltage indicates

High resistance

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