Resistor Function in Mercury Vapor Lamp
What is the purpose of a resistor connected in series with the auxiliary electrode in a mercury vapor lamp?
A. To control the color temperature of the lamp
B. To regulate the voltage of the lamp
C. To control the current flow and power consumption of the lamp
D. To increase the brightness of the lamp
Answer:
The resistor in a mercury vapor lamp, which is connected in series with the auxiliary electrode, controls the current flow and consequently, the power consumption of the lamp.
In a mercury vapor lamp, a resistor is connected in series with the auxiliary electrode. This resistor serves a significant role in determining the flow of current within the lamp, in line with the principles of Ohm's law. The resistor essentially restricts the flow of current, thereby controlling the amount of power that the lamp consumes.
Just like an incandescent light bulb, a mercury vapor lamp is essentially a resistor that heats up when current flows through it and emits visible and invisible light. The resistor, in this case, aids in the allowance of a precise amount of current to flow through the lamp, ensuring its proper operation and longevity. It's quite comparable to how a voltmeter works, where various resistances are placed in series with the meter to measure a particular range of voltages.