Current Electricity part 2

Heating Effect in Current Electricity

In current electricity, Ohm.s law is obeyed by all :

Electric current

Parts of electrical objects that need to let electricity pass through are always made of..........

The parts of electrical objects that need to let electricity pass through are always made of metal, whereas the plastic covering that surrounds wires is an electrical insulator. Give reason.

Name the instrument used to measure the current in an electric circuit.

Name the instrument used to control current in an electric circuit.

A:Current density is a very is a vector quantity . R : Electric current , passing through a given unit area is current density.