Physics
(a) Name and state the law which relates the potential difference and current in a conductor.
(b) What is the necessary condition for a conductor to obey the law named above in part (a)?
Answer
(a) The law which relates the potential difference and current in a conductor is known as Ohm's law.
Ohm's law states that the current flowing through the conductor is directly proportional to the potential difference across it's ends provided that the physical conditions and the temperature of the conductor remain constant.
(b) The necessary condition for a conductor to obey Ohm's law is that the physical conditions and the temperature should remain constant.
Related Questions
Define the term resistance. State it's S.I. unit.
(a) Name the particles which are responsible for the flow of current in a metallic wire.
(b) Explain the flow of current in a metallic wire on the basis of movement of the particles named by you above in part (a).
(c) What is the cause of resistance offered by the metallic wire in the flow of current through it?
Give two differences between an ohmic and non-ohmic resistor.
Figure below shows the I-V curves for two resistors. Identify the ohmic and non-ohmic resistors. Give a reason for your answer.
