Air Tech - Electricity and Magnetism

Ohm's law states that in a circuit if the current is 30 Amperes and resistance is 15 Ohms, then the Voltage will be...

• 450 volts

• 2 volts

• 0.5 volts

• 2 millivolts

An object that allows electricity to flow through it is a

• resistance

• conductor

• insulator

• cotton

The measure of how much a material opposes the flow of current is called

• conductor

• insulator

• electric field

• resistance

Electric current that reverses its direction of flow in a regular pattern is...

• Voltage

• Direct Current

• Alternating Current

• Parallel Circuit

Current that does NOT reverse direction is called ____. 

• magnetic current

• direct current

• circuit current

• alternating current

Temporary magnets...

• are also know as hard iron

• are materials that are easily magnetised

• can be found inside batteries

• are used in aircraft magnetic compass

Placing the two north poles of magnets together would result in which electromagnetic force?

• repulsion

• attraction

• polarity

• intransigence

Lines of force emanating from a magnet are known as

• magnetic fields

• magnetic poles

• magnetic particles

• magic

Changing current from AC to DC is known as...

• rectification

• inverting

• resisting

• volting

The unit of frequency is the hertz (Hz).

It is defined as...

• one unit per minute

• one unit per second

• one unit per hour

• one unit per day