This document provides instructions for an experiment on controlling two lamps with two switches. The experiment aims to demonstrate how appliances can be controlled independently when wired in parallel. The theory section explains that appliances in parallel allows each to be turned on or off separately without affecting the others, unlike in series where all are controlled by a single switch. The procedure details connecting the first lamp and switch, then adding the second lamp and switch in parallel so that switch 1 controls lamp 1 and switch 2 controls lamp 2 independently. The conclusion restates that the two lamps can be controlled separately from different locations using their respective switches.

1. Maharashtra Institute of Technology,
Aurangabad
LABORATORY MANUAL
Practical Experiment Instruction Sheet
EXPERIMENT TITLE : Two lamps controlled by two switches.
EXPERIMENT NO.7: MIT(T)/ETC/Basic Electrical Engineering /Manual No.1
FY(All) DEPARTMENT: Electronics & Telecommunication Engineering
LABORATORY : Basic Electrical Engineering Location Part I Page 35
Aim: Two lamps controlled by two switches.
Apparatus:
1. Wires 2. Switches( SPST) 3. Plugs and Sockets 4. Fuses 5.Lamps 6. Multimeter
Theory :
In a house, there are many electrical appliances that have to run independent of each other. If one
appliance is turned on or off it should not affect the other appliances. This is not possible if all the
appliances were connected in a series arrangement as there would be one switch that either switches all
of them on or off. When appliances are connected in a parallel arrangement, each of them can be put
on and off independently. This is a feature that is essential in a house's wiring.
Also, if the appliances were wired in series, the potential difference across each appliance
would vary depending on the resistance of the appliance. This would make it very difficult to provide
the right power to flow through the appliances. When house wiring is done in parallel this problem
does not arise as the potential difference across each appliance is the same and equal to the potential
difference being provided by the power company. Adding or removing device has no effect on the
others devices because the Voltage in parallel circuit is same but the current is different. Any number
of devices can be added in this kind of circuit, simply by extending the phase and neutral conductors to
other devices.
In this experiment two lamps are connected in parallel combination. Each lamp is provided
a switch to ON and OFF the lamps.
Prepared By: Mr. S.S. Chate Approved By: Dr. G.S. Sable

2. Maharashtra Institute of Technology,
Aurangabad
LABORATORY MANUAL
Practical Experiment Instruction Sheet
EXPERIMENT TITLE : Two lamps controlled by two switches.
EXPERIMENT NO.7 : MIT(T)/ETC/Basic Electrical Engineering /Manual No.1
FY(All) DEPARTMENT: Electronics & Telecommunication Engineering
LABORATORY : Basic Electrical Engineering Location Part I Page 36
Procedure:
1. Collect the required apparatus.
2. Connect the lamp and the switch as shown in the circuit diagram.
3. Check the connections with the help of multimeter.
4. Operate the lamp using the switch.
5. If second lamp L2 is to be connected, then it will be connected in parallel with the L1 Neutral is
directly connected to one point of L2 of batten holder and phase terminal is connected to second
terminal of L2 of batten holder through single pole switch S2.
Wiring Diagram
Conclusion: When S1 is ON, Lamp L1 will glow, and when S2 is ON lamp L2 will glow, thus S1
controls L1 and S2 control L2. Hence two lamps can be controlled from different places
independently.
Prepared By: Mr. S.S. Chate Approved By: Dr. G.S. Sable