Electric current is caused by moving electric charges. The effects of charge and electric fields can be investigated by looking at the forces they exert on conductors and insulators.
What is the charge of an electron?
An atom has a neutral charge, because it contains the same number of protons and electrons. If it loses an electron what does it become?
A positively charged ion
A negatively charged ion
A free electron
What is a flow of charged particles called?
What charged particles flow in a metal when electric current flows?
Why are metals good conductors of electricity?
Metals are electric
Metals are magnetic
Metals contain free electrons
Which of the following materials is an insulator?
What is the direction of conventional current flow?
From the positive terminal of a cell, through the conductor, to the negative terminal
From the negative terminal of a cell, through the conductor, to the positive terminal
Perpendicular to the direction of energy flow
What is the direction of free electron flow?
What direction is marked on all circuit diagrams?
From north to south
The direction of free electron flow
The direction of conventional current
What is the symbol for electric current?