Exercise std 9th sci ch 4 current electricity question answer | Class 9 sci ch 3 question answer

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Exercises
1. The accompanying figure shows
some electrical appliances connected
in a circuit in a house. Answer the
following questions.
A. By which method are the appliances
connected?
B. What must be the potential
difference across individual
appliances?
C. Will the current passing through
each appliance be the same? Justify
your answer.
D. Why are the domestic appliances
connected in this way?
E. If the T.V. stops working, will the
other appliances also stop working?
Explain your answer.
2. The following figure shows the symbols
for components used in the
accompanying electrical circuit.
Place them at proper places and
complete the circuit.
Which law can you prove with the help
of the above circuit?
3. Umesh has two bulbs having
resistances of 15 2 and 30 2. He
wants to connect them in a circuit,
but if he connects them one at a time
the filament gets burnt. Answer the
following.
A. Which method should he use to
connect the bulbs?
B. What are the characteristics of this
way of connecting the bulbs
depending on the answer of A
above?
44
C. What will be the effective resistance
in the above circuit?
4. The following table shows current in
Amperes and potential difference in
Volts.
5.
a. Find the average resistance.
b. What will be the nature of the graph
between the current and potential
difference? (Do not draw a graph.)
c. Which law will the graph prove?
Explain the law.
V (Volts) I (Amp)
4
9
5
6
Match the pairs
'A' Group
1. Free electrons
2. Current
11.25
13.5
'B' Group
a. V/R
b. Increases the
resistance in the
circuit
3. Resistivity
4. Resistances in d. VA/LI
series
c. Weakly attached
6. The resistance of a conductor of
length x is r. If its area of cross-
section is a, what is its resistivity?
What is its unit?
7. Resistances R₁, R₁, R, and R, are
connected as shown in the figure. Sl
and S2 are two keys. Discuss the
current flowing in the circuit in the
following cases.
B
C
A
ww
wwww
R₁
D
E
+
f. X =
a. Both S, and S, are closed.
b. Both S, and S, are open.
F H
e. x = x₁ + x₂ + x,
1
G
b. x is larger than x₁, x₂ and x,
c. x is smaller than x₁, x, and x,
d. The potential difference across x₁, x₂
and x, is the same
+++
I
c. S, is closed but S, is open.
8. Three resistances x₁, x, and x, are
connected in a circuit in different
ways. x is the effective resistance.
The properties observed for these
different ways of connecting x,, X₂
and x, are given below. Write the
way in which they are connected in
each case. (I-current, V-potential
difference, x-effective resistance)
a. Current I flows through x,, x, a
and x,
9. Solve the following problems.
A. The resistance of a 1m long
nichrome wire is 6 Q. If we reduce
the length of the wire to 70 cm.
what will its resistance be?
45
(Answer: 4.2 (2)
B. When two resistors are connected
in series, their effective resistance
is 80 2. When they are connected
in parallel, their effective resistance
is 20 92. What are the values of the
two resistances?
(Answer: 40 2,40 (2)
C. If a charge of 420 C flows through
a conducting wire in 5 minutes
what is the value of the current?
(Answer: 1.4 A)
Project:
Ask an electrician to explain to you
the electrical wiring in your house
and other related important points.
Take care to understand them well,
and explain them to others also.


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