Current Electricity Grade 9

Current in a circuit flows:

• in a direction from high potential to low potential

• in a direction from low potential to high potential

• in the direction of flow of electrons

• in any direction

The unit of potential difference is

• ampere

• volt

• ohm

• coulomb

The correct relation is

• 1J = 1C/1V

• 1J= 1V/1C

• 1J = 1C X 1V

• 1J X 1V X 1C = 1

On increasing the resistance in a circuit, current in it:

• decreases

• increases

• remains unchanged

• nothing can be said

Which of the following expression is correct?

• R=VI

• V=IR

• R=I/V

• I=R/V

What is the resistance offered by the filament of a bulb with potential difference of 12 V and current of 3A in a circuit

• 8 $\Omega$

• 4 $\Omega$

• 24 $\Omega$

• 6 $\Omega$

In transferring 1.5 C charge through a metallic wire, 9J of work is needed. Find the potential difference across the wire.

• 6 V

• 12 V

• 18 V

• 24 V

A cell of potential difference 12 V is connected to a bulb. The resistance of filament of bulb when it glows is 24  $\Omega$  . Find the current drawn from the cell.

• 0.5 A

• 5A

• 0.2 A

• 2 A

Find the odd one out

• Impure water

• Silver

• Glass

• Copper

0.5 C charge passes through a section of a conductor in 5s. Find the current

• 0.1 A

• 0.25 A

• 0.025

• None of these