(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 VI 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. De

1.	(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 VI 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?
Answer» (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?