Required Practical: V-I Characteristics Flashcards
What is the purpose of the required practical activity concerning V-I characteristics?
The purpose is to investigate the V-I characteristics of a filament lamp, a diode, and a resistor at constant temperature.
What materials are needed for the V-I characteristics experiment?
Materials include:
an ammeter and milliammeter or multimeter
voltmeter or multimeter
component holders
a 12 V, 24 W lamp
resistor
diode with protective resistor
rheostat
connecting leads.
How is the V-I characteristic of a resistor investigated?
The circuit is connected with the resistor, and readings of current and potential difference are recorded for different settings of the variable resistor. A graph of current (A) against potential difference (V) is plotted.
Describe the procedure for investigating the V-I characteristic of a lamp.
The lamp is substituted for the resistor in the circuit, and similar readings of current and potential difference are recorded. A graph is plotted, typically resulting in a curved line of best fit.
How is the V-I characteristic of a diode investigated?
The circuit is modified to include a protective resistor labeled ‘P’. Readings of potential difference and current are obtained for the diode, and a graph of current against potential difference is plotted. There should be no negative values of current.
