(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

What do you understand by the term electric current?

State and define the SI unit of electric current.

State the relation between electric current; the number of electrons moving in a circuit and time in seconds.

How electric current flows in solids?

How electric current flows in liquids?

How is potential difference related to work done and quantity of charge?

A charge of 8860 C flows through an electric circuit in 2 min and 40 s. Calculate the magnitude of current in a circuit.

Calculate the total number of electrons flowing through a circuit in 20 mins and 40 s, if a current of 40 μA flows through the circuit.
[1 e^– = 1.6 × 10^-19 C]

4 × 10²⁰ electrons flow through a circuit in 10 hours. Calculate magnitude of current. [1 e- = 1.6 × 10^-19 C]

What is the electrical potential at a point in an electric field when 24 J of work is done in moving a charge of 96 C from infinity?

Select the correct option:

In a metallic conductor, electric current is thought to be due to movement of:

Assuming that the charges of an electron is 1.6 × 10^-19 coulombs, the number of electrons passing through a section of wire per sec, when the wire carries a current of one ampere is:

State two conditions necessary for a circuit, such that electric current flows through it.

What do you understand by the term electric resistance?

Why does the filament of an electric bulb in an electric circuit get white-hot, but not the connecting wires?

What do you understand by the term series circuit?

State two characteristics of resistances in the series circuit.

Draw a diagram showing two bulbs connected in series to a dry cell.

What do you understand by the term parallel circuit?

State two characteristics of resistance in the parallel circuit.