CPL Acft 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
• insulator
• conductor
• cotton

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

• conductor
• insulator
• electric field
• resistance

An electric current is traveling in a wire. A compass is placed under the wire with the current flowing from north to south. In response, the compass needle will-

• rotate because of a magnetic force that acts on the needle

• rotate because of an electric force that acts on the needle

• not move because moving electric charges do not exert magnetic forces on the needle

• not move because moving electric charges do not exert electric forces on the needle

Which of the following is an example of a resistor?

• battery

• light bulb

• wire

• switch

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 known as electromagnets

• are materials that are easily magnetised

• can be found inside batteries

• are used in aircraft magnetic compasses

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!