NCEA Level 1 Science/Contents/DC Electricity

=DC Electricity=

About the Achievement Standard



Introduction
Direct current electricity is the one way flow of electric charges. It can be produced by sources like batteries. The current may flow through a conductor such as a wire, semiconductors such as insulators, or even through a vacuum. The electric charge flow in a constant direction, distinguishing it from alternating current (AC).

Contents

 * 1) Voltage
 * 2) Current
 * 3) Resistance
 * 4) Power in DC circuits
 * 5) Circuit diagrams
 * 6) Voltage and current behaviour in circuits