The diagram in Fig. 8.42 shows a
in Fig. 8.42 shows a cell of e.m.f.
volt and internal resistance r = 1 ohm
connected to an external resistance R = 4 ohm. The
ammeter A measures the current in the circuit and
the voltmeter V measures the terminal voltage across
the cell. What will be the readings of the ammeter
and voltmeter when (i) the key K is open, and
(ii) the key K is closed.
→X
ns. A
s the
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Answers
Answer:
Read the following and answer any four questions:
The following is the diagram of an electric motor:
a) Which part of the electric motor in the above figure) can be used as an armature after
some modifications?
(1) POXY
(n) YXOP
(I) ABCD
(iv) ABPQ
Page (4)
b) What are these modifications in oned above?
1) large number of turns
il) s soft iron core
(1) both large n core
(iv) none of these
Which part in the above diagram is replaced by an electromagnet in order to make a
Commercial motor?
(1) X and Y
(ii) Pando
(im) R
(iv) None of these
d Which part in the above diagram is a device that reversendis the direction of flow of
current through a circuit?
1) X and Y
(11) P and Q
(117) R
(iv) None of these
Which part in the above diagramis used as an axle in the electric motor?
6) X and Y
(11) P and q
(in) R
(iv) None of these