Characteristics of lamps (1)
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This document describes an experiment to study the voltage-current (V-I) characteristics of an incandescent lamp and a compact fluorescent lamp (CFL). The experiment involves connecting each lamp to an autotransformer and measuring the current and voltage across the lamp as the transformer output is increased and decreased. Readings will be recorded in a table and used to plot the V-I characteristics and calculate theoretical values like resistance and power. The goal is to understand how current changes with voltage for each type of lamp.
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Characteristics of lamps (1)
- 1. CharacteristicsOfLamps Exp. No: Date: Aim: To study the VโI characteristics of Incandescent (Tungsten Filament Lamp) and Compact Fluorescent Lamp (CFL). Apparatus required: S.No Name of the equipment Range/ Specification Type Quantity 1 Voltmeter (0-300) V MI 1 2 Ammeter (0-0.2) A MI 2 3 Tungsten filament Lamp 40W, 230V Incandesce nt 1 4 Compactfluorescent lamp (CFL) 18W, (220-240)V Discharge 1 5 1- Phase Auto Transformer I/P: 1-ษธ, 230V O/P: (0-270)V, 10A Core type 1 6 Connecting wires 1.5 Sq.mm Copper Required
- 2. Circuit diagram: Procedure: 1. Connect the circuit as per circuit diagram. 2. Increase the autotransformer output voltage in steps of 30 V, until the lamp rated voltage is obtained. 3. At each step, note the readings of V, A1, and A2 record them in Table. 4. Decrease the autotransformer output voltage in steps of 30V from lamp rated voltage i.e. 230V to zero volts and tabulate them.
- 3. Tabular column: S No Supply Voltage (Vs) Current (A1) (Tungsten) Current (A2) (CFL) Lamp condition Incr Decr Incr Decr Incr Decr Incr Decr Theoreticalcalculations: Tungstun filament lamp: Power (P) = ๐2 ๐ Cold resistance of the filament R0 = ๐2 ๐ Current drawn by the filament when it is cold I0= โ ๐ ๐ Hot resistance of the filament R = ๐ ๐ผ (OR) Hot resistance of the filament R = R0 ( 1+ ฮฑ โ T ) Current drawn by the filament when it is hot I = ๐ ๐ ๏ท R0 is the original resistance(Cold) (OR) Resistance at room temperature(T0) ๏ท R is the resistance after a temperature change(T)
- 4. ๏ท โ T is the changein temperature=(T-T0) ๏ท ฮฑ is the temperature coefficient of resistivity (4.5 ร 10โ3) CFL Lamp: Power (P) = V I I = ๐ ๐ R = ๐ ๐ผ Modelgraph: Precautions: 1. Use properrange of the meters. 2. Take the readings without parallax error 3. All the connections should be tight. Result: