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 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 1

Answer:

An instrument which measures electric current is ammeter. SI unit of current is Ampere which is denoted by letter A. One coulomb of electric charge flows through any cross section of a conductor in one second the electric current flowing through it is said to be one ampere.

Explanation:

Answer 2

Answer:

A)ammeter Si unit is Ampher

b) variable resistance

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