Question

b. Does the resistance of the electric light bulb increase, decrease or remain constant as the power, I*V, is increased? Consult your data table. Does the temperature of the light bulb filament increase, decrease or remain constant as c. the power, IV, to the bulb is increased? (Hint: Associate a higher electrical power with 3. Does the diode conduct symmetrically when the current flows in the forward (positive 4. Why is it that we always connect a voltmeter in parallel but an ammeter in series with the 5. A short circuit is when there is zero resistance and an open circuit is where there is infinite an increase in temperature.) voltage) and the reverse (negative voltage) direction? section of the circuit being tested? resistance. Use your experimental results to justify this statement: "a diode approximates an open circuit in one way and a short circuit in the other way.” (Hint: Think of how the slopes of open and short circuits would appear on a (V,1) plot and then compare them to your diode plot.) 5 Discussion

Answer 1

3. No , the diode does not conduct symmetrically when the current flows in the forward (positive voltage) and the reverse (negative voltage) direction.
In forward bias , after a knee voltage diode behaves close to an open switch and the current increase exponentially with the voltage applied while in reverse bias diode conduct a very very small current which is essentially negligible for most purposes and can be considered as open circuit

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