Resistors and IV graphs: Electricity: Physics: GCSE (9:1)

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17 Terms

1
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Ohm's Law (V = IR)

The current flowing through a device is directly proportional to the potential difference across the it (providing the temperature remains constant)

<p>The current flowing through a device is directly proportional to the potential difference across the it (providing the temperature remains constant)</p>
2
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Directly proportional

When a graph of two variables is a straight line that passes through the origin (0,0)

<p>When a graph of two variables is a straight line that passes through the origin (0,0)</p>
3
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Ohmic conductor

A device that obeys Ohm's Law

<p>A device that obeys Ohm's Law</p>
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Fixed resistor

An ohmic conductor that obeys Ohm's Law because its resistance is fixed

<p>An ohmic conductor that obeys Ohm's Law because its resistance is fixed</p>
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Filament bulb

Not an ohmic conductor because it doesn't obey Ohm's Law

<p>Not an ohmic conductor because it doesn't obey Ohm's Law</p>
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Diode

Not an ohmic conductor because it doesn't obey Ohm's Law

<p>Not an ohmic conductor because it doesn't obey Ohm's Law</p>
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Reason why a filament bulb is not an ohmic conductor

The filament gets hot which causes its resistance to increase

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Reason why a diode is not an ohmic conductor

Its resistance changes depending on which direction the current flows through it

9
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IV (current-potential difference) graph

a graph used to show how the current through a component varies as the potential difference across it changes

<p>a graph used to show how the current through a component varies as the potential difference across it changes</p>
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What the gradient of an IV graph represents

The resistance of a component (equal to 1/R)

<p>The resistance of a component (equal to 1/R)</p>
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What a steep line on an IV graph represents

A device with a low resistance because increasing the potential difference by a small amount causes a large increase in current

<p>A device with a low resistance because increasing the potential difference by a small amount causes a large increase in current</p>
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What a shallow line on an IV graph represents

A device with a high resistance because increasing the potential difference by a small amount causes a small increase in current

<p>A device with a high resistance because increasing the potential difference by a small amount causes a small increase in current</p>
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IV graph for a fixed resistor

A straight line which passes through the origin

<p>A straight line which passes through the origin</p>
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IV graph for a filament lamp

A s-shaped curve which passes through the origin

<p>A s-shaped curve which passes through the origin</p>
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IV graph for a diode

The graph a horizontal line along the x-axis until it reaches around 0.6 V, where it then becomes a straight line with a steep gradient

<p>The graph a horizontal line along the x-axis until it reaches around 0.6 V, where it then becomes a straight line with a steep gradient</p>
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Thermistor

The resistance of a thermistor decreases as the temperature increases

<p>The resistance of a thermistor decreases as the temperature increases</p>
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LDR (light dependent resistor)

The resistance of an LDR decreases as light intensity increases

<p>The resistance of an LDR decreases as light intensity increases</p>