Question

NUMERICALS
V
B
6.
the voltmeter V measures the terminal voltage across
A
7.
х
(ii) the key K is closed.
8.40
V
Ans. A
K
А
R
ves the
steeper
s small
Fig. 8.42
The diagram in Fig. 8.42 shows a cell of e.m.f.
connected to an external resistance R = 4 ohm. The
E = 2 volt and internal resistance r = 1 ohm
ammeter A measures the current in the circuit and
the cell. What will be the readings of the ammeter
and voltmeter when (i) the key Kis open, and​

Answer 1

Answer:

Current through voltmeter, I1=1179000=0⋅013A

Current through R, I2=I−I1

=0.13−0.013=0.117A

(i) Resistance, R=1170⋅117=1000Ω

(ii) Power input to R=I22R

=(0⋅117)2×1000=13⋅689 watt

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