Section D: Give a long answer to the question given below.
36. (i) How is electric current related to the potential difference across the terminals of a conductor?
Draw a labelled circuit diagram to verify this relationship.
(ii) Why should an ammeter have low resistance?
(iii) Two V - I graphs A and B for series and parallel combinations of two resistors are as shown. Giving reason state which graph shows
(a) series, (b) parallel combination of the resistors.
Draw a labelled circuit diagram to verify this relationship.
(ii) Why should an ammeter have low resistance?
(iii) Two V - I graphs A and B for series and parallel combinations of two resistors are as shown. Giving reason state which graph shows
(a) series, (b) parallel combination of the resistors.
(i) The electric current and the potential difference across the terminals of a conductor is related by .
It states that, at a constant temperature, the steady current '\(I\)' flowing through a conductor is to the potential difference '\(V\)' between the two ends of the conductor.
It states that, at a constant temperature, the steady current '\(I\)' flowing through a conductor is to the potential difference '\(V\)' between the two ends of the conductor.
It states that .
(ii) Since in series connection, remains constant.
We know from Ohm's law that more the resistance of the ammeter, the current which flows through the ammeter.
Hence in order to measure the maximum current in the circuit, the ammeter must have low or negligible resistance.
Hence in order to measure the maximum current in the circuit, the ammeter must have low or negligible resistance.
(iii) The slope of V-I graph gives the resistance. 'A' represents combination because A is steeper than 'B'.
So the resistance of 'A' is than 'B'. As we know resistance in parallel combination is than series combination.
So the resistance of 'A' is than 'B'. As we know resistance in parallel combination is than series combination.