# Graph Worksheet

Mostly on fixed resistor, filament and diodes.

- Created by: Rosa
- Created on: 20-12-12 22:48

First 230 words of the document:

Current-Voltage Characteristics

This sheet looks at the current-voltage (I-V) curves for a fixed resistor, a filament

bulb and a semiconductor diode.

Useful formulae

If you know the current through and voltage across an electrical component

write down the formula used to find:

a) the component's resistance and

b) the power dissipated in the component.

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1. The fixed resistor

1. Sketch the I-V curve for a fixed

resistor

2. A fixed resistor has current of 12

mA when the potential difference is 2.5

V. What is the resistance of this resistor?

3. What current will flow with a pd of:

a. 6 V

b. -2.5 V

c. -0.2 V

d. 48 kV

4. What voltage is needed to generate

a current of

a. 1 A

b. 60 mA

5. What is the resistance of the

resistor at

a. 60 V, b. 0.1 V, c. 679.4 V

6. Fixed resistors are said to be

`ohmic'. What does this mean?

On the axes to the left sketch

a) the I-V curve for an ohmic resistor

that has very high resistance. Label this

line `high R'.

b) the I-V curve for an ohmic resistor

that has low resistance. Label this line

`low R'.

c) Explain how you made your choice.

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