Answer:
(a)
An instrument that measures electric current in a circuit is called ammeter.
The unit of electric current is ampere (A).
1 ampere is constituted by the flow of 1 coulomb of charge
through any point in an electric circuit in 1
second. (1)
(b) (i) Rheostat
(ii) Plug key or switch
(c) (i) The electric circuit diagram to study the given relation
is shown below
(1)
(ii) Following graph was
plotted between V and I values
(1)
At potential difference 0.8V, ?(i)
At potential difference 1.2 V, ?(ii)
?(iii)
Conclusion If I be the current through XY resistor and V be the potential
difference across it, then the ratio constant.
and Ohm's law is obeyed. (1)
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