$(a)$ 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 ?
$(c)$ 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 $V / I$ 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 ?
$(a)$ 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 ?
$(c)$ 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 $V / I$ 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 ?
$(a)$ An ammeter measures electric current in an electric circuit.
If one coulomb of charge flows through a circuit in one second, then the current in the circuit is said to be one ampere.
$(b)$ $(i)$ Variable resistor and
$(ii)$ closed key.
$(c)$ $(i)$ The circuit diagram is as shown below
$(ii)$ Since the graph is a straight line, therefore, the value of $V / I$ at every point will be same. This value gives the resistance of the circuit for which these $V$ and $I$ values are obtained.
For a potential of $1.6 V$, the current in the circuit is $0.6\, A,$ therefore, resistance of the circuit is
$R =\frac{ V }{ I }=\frac{1.6}{0.6}=2.67 \Omega$
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$(a)$ Name an instrument that measures electric current in a circuit. Define unit of electric current
$(b)$ What are the following symbols mean in an electric circuit ?
$(c)$ Draw a closed circuit diagram consisting of $0.5\, m$ long nichrome wire $XY,$ an ammeter, $a$ voltmeter, four cells of $1.5\, V$ and a plug key.
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$(b)$ What are the following symbols mean in an electric circuit ?
$(c)$ Draw a closed circuit diagram consisting of $0.5\, m$ long nichrome wire $XY,$ an ammeter, $a$ voltmeter, four cells of $1.5\, V$ and a plug key.