Start practising
Practice mode Current Electricity

Which of the following is a non-ohmic device?

Correct answer C. A semiconductor diode

Explanation

A semiconductor diode conducts easily in one direction only and its current rises non-linearly with voltage, so V/I is not constant. Metal wires and carbon resistors at constant temperature obey Ohm's law.

Report a problem

Answer checked How we write and check questions

Tip: press A, B, C or D to answer, and N for the next question.

Advertisement

More Current Electricity questions

See all
Question 01 Current Electricity

Which statement correctly describes a superconductor?

Correct answer A. Its resistance becomes zero below a critical temperature

Open question
Question 02 Current Electricity

Why must a car battery have a very low internal resistance?

Correct answer A. So it can supply a large starting current without a large drop in terminal voltage

Open question
Advertisement
Question 03 Current Electricity

When a cell supplies current to an external resistor, how does its terminal potential difference compare with its emf?

Correct answer B. It is less than the emf because of the voltage drop across the internal resistance

Open question

Discussion

Have a question about this answer?

Your email address will not be published. Required fields are marked *

Links and website addresses are not allowed in comments.