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Ohmic and Non Ohmic Resistors

What is an oh...

Question

What is an ohmic resistor ? Give one example of an ohmic resistor. Draw a graph to show its current-voltage relationship. How is the resistance of the resistor determined from this graph?

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Solution

An ohmic resistor is a resistor that obeys Ohm’s law. For example: all metallic conductors (such as silver, aluminium, copper, iron etc.)

The slope of the V-I graph gives the resistance.

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Similar questions

Give two differences between an ohmic and non-ohmic resistor.

Fig 8.13 below shows the I-V characteristic curves for four resistors. Identify the ohmic and non-ohmic resistors. Give a reason for your answer.

What are non-ohmic resistors ? Give one example and draw a graph to show its current voltage relationship.

(i) Draw a graph of V versus I for an ohmic resistor.

(ii) How can you find the resistance of the resistor from the graph.

(iii) What is a non-ohmic resistor?

The graph of potential difference (V) versus current (I) for an ohmic resistor is a straight line as shown below:

The resistance of the resistor can be determined from this graph as:

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Ohmic and Non Ohmic Resistors

Standard X Physics

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