Electrical Current

A current can heat …

It can have a chemical action when passing through …

Current can produce a … effect.

 We can measure currents by    …  their heating, chemical or magnetic effects.

The practical unit of current is called...

Two things are necessary to cause an electric current to flow: a complete circuit, and the second - … 

A battery has a surplus of electrons on one …

What are the most common sources of electromotive force?

The practical unit of the electromotive force is …

The insulators are substances which have a high … 

The practical unit of resistance is …

Substances which are not insulators …