AIM: To draw the diagram of given open circuit comprising at least a battery,
resistor/rheostat, key, ammeter and voltmeter. Mark the components that are
not connected in proper order and correct the circuit and circuit diagram.
APPARATUS AND MATERIAL REQUIRED: A given open circuit
comprising at least a battery, plug key, resistor, ammeter, voltmeter; and
connecting wires and a piece of sand paper.
THEORY: Electric circuits can either be functional or open type.
Functional electrical circuit. An electrical circuit is functional only if all the
components are connected in proper order, assuming that all circuit
components/devices are in working condition and key is closed. With closed
key, all components satisfy the property of continuity.
Open electrical circuit. An open circuit means there is a break in some part of
the circuit. This break may be either deliberate such as key left in open position
or a fault such as broken wire, some burnt out components or a loose
connection. This circuit shows discontinuity for one or more components.
PROCEDURE:
1. Draw the given circuit diagram in your notebook.
2. In the above diagram, mark the components which have not been
connected in proper order.
3. Make a list of all components in the observation table and mark a () in
appropriate column against each component.
4. Now draw the correct circuit diagram.
5. Assemble and connect the electrical components in accordance with the
corrected circuit diagram.
6. Insert a plug in the key and note the deflections in ammeter and voltmeter.
Deflections in these meters towards right hand side verify that the corrected
circuit is functional.
RESULT:
The circuit assemble by connecting components in proper in proper order is
functionally correct as verified by passing current through it.
PRECAUTIONS:
1. Before making the connections, ends of the connecting wires must be
cleaned properly with a piece of sand paper.
2. The ammeter should be connected in series with the resistor and the
voltmeter in parallel with it.
3. The positive terminals of ammeter and voltmeter should be connected to
the positive terminals of the battery.
4. Rheostat should be connected in the circuit using its one end terminal and
the other variable terminal.
5. The plug key should be kept open throughout. It should be closed only at the
time of checking the continuity of the circuit.
OBSERVATIONS:
Table: For checking order of connections of circuit
components. Make a () in appropriate column
S. No. Circuit Component Circuit Connection Incorrect connection
1. Battery
2. Resistor
3. Rheostat
4. Key
5. Ammeter
6. Voltmeter
