(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 the electric circuit diagram 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
using above circuit
What would be the values of 
ratios
when the potential difference is 0.8 y 1.2 V and 1.6 y respectively? What conclusion
do you draw from these values?
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)
You need to login to perform this action.
You will be redirected in
3 sec
