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Slope of the volts vs resistance characteristics for fluroscent and incandescent lamps?
Wiki User
∙ 11y ago
the resistance of an incandescent lamp is very low until it reaches its operating temperature of 6000deg K or so
get a sixty watt bulb and measure its resistance chances are its under 5 ohms
depending on the mass of tungsten it takes a few cycles at this 60 amps to get up to temperature.
voltage is constant calling the wiring a voltage source (if the wiring didnt have resistance the bulbs of higher wattages would probably burn out when starting)
fluorescent lamps have a bit of Mercury in a near vacuum nearly infinite resistance when cold
it is heated to boiling with a combination of either filaments and/or high voltage
then the gas changes to plasma and its in essence a better conductor than solid metal at that temperature 9000K or so
an 8foot tube starts at 800v to 1000v and may run at under 100
depending on the ballast (preheat. rapid start. instant start)
and the power (normal,HO,VHO,SHO)
the ballast mostly limits the current the plasma can consume but is necessary to start the plasma conducting in longer tubes
Wiki User
∙ 11y ago
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What does the slope of voltage-current curve represent?
It depends. If voltage is drawn along the horizontal axis, then the slope at any point on the graph represents the reciprocal of resistance at that point. If current is drawn along the horizontal axis, then the slope at any point on the graph represents the resistance at that point.
What is the incremental resistance obtained from the diode equation?
The incremental resistance of a diode is the inverse of the slope of the V-I curve at the operating point.
What are Ac load lines in an amplifier and how they are drawn?
The dc load resistance is Rc but the AC Load resistance is (RcRl). If a load line is drawn the slope of which is -1(Rc Rl) . Then it is called an AC load line and it is to be used when the transistor is operating as an amplifier.
What is dynamic resistance of diode?
The Current-Voltage relationship of a diode is not constant (not a straight line) and hence the resistance cannot be measured. Due to this non-linear nature of the the curve, there exists a unique value of resistance at every point of the curve which is called dynamic resistance (not static of constant resistance). The dynamic resistance equals the change in voltage divided by the change in current, when the voltage is changed by a small amount. In other words it is the slope of the graph of voltage against current. The dynamic resistance is different at different current values. About 30 years ago, and I do not remeber the brand or maker, there was a digital multimeter that DID measure dynamic resistance in diodes. It was a God Send for testing diodes in circuit. Diodes only conduct in one direction, so the device would show an open in one direction and a resistance under 1000 ohms on the other or a short (0 ohms).
Why does slope overload occur in delta modulation?
To reduce slope overload distortion ,the step size must be increased when the slope of the input signal is high. The sawtooth is better able to match the message in the regions of steep slope.
What is the nature of the slope of the voltage-resistance characteristics for the carbon lamp?
for Tungsten lamp the slope of the curve is positive where for carbon it is negative
What are the characteristics of an inclined plane?
slope, lenth and hight
What controls the rate of movement of ground water?
Gravity (slope) and resistance.
What is the name for a superheated incandescent cloud of gas and volcanic ash that travels swiftly down a volcanic slope as an avalanche?
nuee ardente
Which of these are characteristics of two lines that coincide?
Same slope and intercepts
How does a slope affect velocity?
the steeper the slope, the faster the velocity because the pull of gravity will be applied more since the resistance will be lower.
What does the slope of voltage-current curve represent?
It depends. If voltage is drawn along the horizontal axis, then the slope at any point on the graph represents the reciprocal of resistance at that point. If current is drawn along the horizontal axis, then the slope at any point on the graph represents the resistance at that point.
What are characteristics of farming?
Flat, narrow fields stepping up the slope, horizontal tillage [ 90 degrees to the slope of the hillside ].
What does the slope of a graph potential difference vs current represent?
resistance of a material
When you walk up an inclined plane your legs supply the effort force What is the resistance force?
the resistance force is the slope of the plane, or the hypotenuse.
What are characteristics of an indifference curve?
indifferent curves are convex to their origin, they do not intersect, and have a negative slope
What is the slope of the graph of versus for an ohmic material?
"Ohmic" means it obeys Ohm's law (V=IR, i.e., voltage = current x resistance). Since Ohm's law can be understood to be a definition of resistance, what this really means is that the material has a constant resistance. In such a case, the slope of current as a function of voltage will be a straight line passing through the origin.
