Aircraft Electrical Test 1

What does an ammeter measure?

Current

In a parallel circuit, how does the voltage across each branch compare?

It is equal across all branches

What is the main advantage of a digital multimeter (DMM) over an analog multimeter?

Higher accuracy and resolution

What defines the valence of an atom?

Number of electrons in the outer shell

What is the process of an atom gaining or losing electrons called?

Ionization

What is the sensitivity of a meter movement?

The amount of current required for full-scale deflection

What type of resistor is used in a voltmeter to measure high voltages?

Multiplier resistor

What happens if the leads of an ohmmeter are connected across a live circuit?

The meter may be damaged

What does the color code on a resistor indicate?

The resistance value and tolerance

Which of the following materials is a good conductor?

Copper

Which of the following materials has the highest resistance?

Nichrome

What is the total resistance in a parallel circuit with resistors of equal value?

Less than the smallest resistor

Which law is used to calculate the total resistance in a series circuit?

Ohm's law

What is the power dissipation formula in a DC circuit?

P = IV

What is the purpose of a shunt resistor in an ammeter?

Protect the ammeter from high current

What law relates to voltage, current, and resistance?

Ohm's Law

Which of the following devices can be used to test a diode?

Digital multimeter (DMM)

What is a common use for a potentiometer in aircraft electronics?

Adjust volume control

What is the main difference between a potentiometer and a rheostat?

Potentiometer varies voltage; rheostat varies current

What is the purpose of a Wheatstone Bridge?

Measure unknown resistance accurately

What is a megohmmeter used for?

Measuring high resistances

What causes static electricity to accumulate on an aircraft?

Friction between air and the aircraft

What happens to the current in a series circuit?

It remains constant through each component

What is piezoelectric material?

A material that generates electricity from mechanical pressure

What is Kirchhoff's Voltage Law?

The total voltage around a closed loop is zero

What type of circuit does an ohmmeter create to measure resistance?

Series circuit with a battery

What is the formula for Ohm's Law?

V = IR

Which of the following is NOT a factor affecting resistance?

Color of the conductor

What type of signal is typically analyzed using an oscilloscope?

Alternating current (AC)

Which of the following materials is considered a good insulator?

Rubber

Which of the following is a source of electricity?

All of the above (Chemical reaction, Friction, Magnetic field)

Which of the following statements is true about static wicks?

They are used to dissipate static electricity

What device gives a visual representation of an electrical signal?

Oscilloscope

What device is used to dissipate static charges from an aircraft?

Static wick

What is the basic unit of electric current?

Ampere

Which particle of an atom has a negative charge?

Electron

What does a voltmeter measure?

Voltage

How should a voltmeter be connected in a circuit?

In parallel

What does an ohmmeter measure?

Resistance

Which method is used for damping in an ammeter?

Electrical damping

What is an atom composed of?

Protons, neutrons, and electrons

What happens to the total resistance if more resistors are added in parallel?

It decreases

How should an ammeter be connected in a circuit?

In series

How does static electricity affect aircraft radios?

Causes interference

What does a Wheatstone Bridge circuit measure?

Resistance

What is the purpose of the zero-adjustment knob on an analog multimeter?

Set the pointer to zero before measurement

What is the unit of electrical resistance?

Ohm

Which of the following devices is used to measure frequency?

Oscilloscope

What is the effect of increasing the length of a wire on its resistance?

Increases resistance

What is static electricity?

Electricity at rest