Electricity

An electric current that regularly changes its direction and size.

• alternating current

• direct current

A device used to measure electric current.

• ammeter

• voltmeter

• ruler

• caliper

This comes in two forms, positive and negative.

• charge

• current

• voltage

• amps

The movement of charge through a conductor in one direction only.

• direct current

• alternating current

The capacity for doing work.

• electricity

• energy

• work

• me

Energy transferred by a force.

• work

• electricity

• electrical energy

• movement

A device used to measure potential difference or voltage.

• voltmeter

• ammeter

• caliper

• ruler

The potential difference across a cell, electrical supply or electrical component. It is measured in volts (V).

• voltage

• amperes

• current

• resistance

A resistor where the value of the resistance can be changed.

• variable resistor

• thermistor

• resistor

• current

An electrical device whose resistance decreases as its temperature increases.

• thermistor

• resistor

• variable resistor

• fixed resistor