8 CBSE ELECTRICAL CONDUCTIVITY

What is electrical conductivity?

• electricity currents

• a measure of how well electricity can move through a material

• a measure of how much electricity there is

• being able to turn lights off anf on

When a switch is opened,

• The electrons flow

• The light will be on

• The light will be off

• The battery is not working

A bulb placed in the electric circuit in the given experimental set-up does not glow because: 

• The liquid used in the above experiment may be a strong electrolyte.

• The liquid used in the above         

  experiment may not be conducting

   electricity.

• The bulb may be fused

• Both [B] and [C]

In a complete electrical circuit, which materials do electricity permits flow through?

• Electrical insulators

• Only leads or wires

• Electrical conductors

• Only batteries

Most electrical wiring is made of

• Cloth

• Zinc

• Copper

• Glass

Distilled water is

• Electric conductor
• semiconductor
• Insulator
• Resistor