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Standard X

Physics

Ohm's Law

a Name an ins...

Question

(a) Name an instrument that measures electric current in a circuit. Define the unit of electric current.
(b) What do the following symbols mean in circuit diagrams?
(i) (ii)
(c) An electric circuit consisting of a 0.5 m long nichrome wire XY, an ammeter, a voltmeter, four cells of 1.5 V each and a plug key was set up.
(i) Draw a diagram of this electric circuit to study the relation between the potential difference maintained between the points 'X' and 'Y' and the electric current flowing through XY.
(ii) Following graph was plotted between V and I values:

What would be the values of $\frac{V}{I}$ ratios when the potential difference is 0.8 V, 1.2 V and 1.6 V, respectively? What conclusion do you draw from these values?

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Solution

(a) An ammeter is used to measure the current in a circuit. Unit of electric current is ampere.

(b) (i) Variable resistance or Rheostat (ii) A closed switch

(c) (i)

(ii) $\frac{V}{I}$ for 0.8 V, 1.2 V and 1.6 V is the same as the graph between the voltage and the current is a straight line. So, the $\frac{V}{I}$ ratio is constant for all the values of current and voltage.

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Similar questions

Q. An electric circuit consisting of a

0.5 m

long nichorome wire

X Y

, an ammeter, a voltmeter, four cells of

1.5 v

each and a plug key was set up.
(i) Draw a diagram of this electric circuit to study the relation between the potential difference maintained between the points

^{'} X^{'}

and

^{'} Y^{'}

and the electric current flowing through

X Y

.
(ii) Following graph was plotted between

V

and

I

values:
What would be the values of

\frac{V}{I}

ratios when the potential difference is

0.8 V, 1.2 V

and

1.6 V

, respectively? What conclusion do you draw from these values?

An electric circuit consisting of a 0.5 m long nichrome wire XY, an ameter, a voltmeter four cells of 1.5 V each and a plug key was set up.
(i) Draw a diagram of this electric circuit to study the relation between the potential difference maintained between the points 'X' and 'Y' and the electric current flowing through XY.
(ii) Folloiwng graph was plotted between V and I values:
What would be the values of $\frac{V}{I}$ ratios when hte potential difference is 0.8 V, 1.2 V and 1.6 vrespectively ?
What conclusion do you draw from these values?

What would be hte values of $\frac{V}{I}$ ratios when the potential differece is 0.8 V, 1.2 V and 1.6 V respectively what conclusion do you draw from these values?
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Q. (a) Name an instrument used for measuring electric potential difference?
And with the help of the diagram show how this instrument is connected in an electric circuit?
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