Stefan's law
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Voltage |
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Procedure
- First increase the voltage (from V=0) slowly till the filament start glowing and record corresponding voltage and current in Table I.
- After that, decrease the voltage gradually till the glow ceases. Record again the voltage and current in Table I.
- Calculate the resistance for both the cases and take the average of them as the draper resistance (Rd).
- Increase the voltage of power supply in small steps (0.5, 1.0, 1.5, ...) and record corresponding current (in mA) in Table-II.
- Calculate the resistance of the filament R=V/I and the corresponding power P=VI for individual readings.
- Plot log10R v/s log10T graph. The graph should be straight line for V≥2.5 V. Estimate the slope of the straight line from the graph.
- Hover your cursor over the slider handle and use the up and down arrow keys on keyboard for fine tuning.
