Aircraft Mechanic Engineering Electrical

What is an anion?

An atom that gains an electron, resulting in a negative ion.

What is a cation?

An atom that loses an electron, resulting in a positive ion.

What is the measure of the rate at which electrons flow?

Current

What are the six sources of electricity in aviation?

1. Induction 2. Chemical Battery 3. Pressure 4. Thermal

5. Friction 6. Light

What is voltage?

The electrical pressure that pushes electric current through a circuit, measured in volts (V).

What are the four factors affecting resistance within a conductor?

1. Material 2. Size of the wire 3. Temperature 4. Diameter of the wire

What is watt?

A unit of power.

Who invented horsepower?

James Watt

What is horsepower?

One horsepower is required to move 33,000 pounds one foot in one minute.

In a series DC circuit, what value is constant?

Current is constant.

In a parallel DC circuit, what value is constant?

Voltage is constant.

What is voltage drop?

Loss in electrical pressure caused by electrons passing through a resistor.

What is the purpose of the last color band on a 4-band resistor?

It indicates the multiplier.

What happens if there is no 4th band on a resistor?

The tolerance is 20%.

What happens to total resistance when resistors are in a parallel circuit?

Total resistance decreases.

What are Kirchhoff's Laws?

The total voltage around a closed loop is zero.

How does a galvanometer work?

It uses electric current to twist a coil, moving a pointer across a scale.

What causes needle deflection in a galvanometer?

Lorentz Force.

In what orientation is an analog ammeter installed in a circuit?

Installed only in series.

What precautions should be taken when using an ammeter?

Never connect an ammeter in parallel as it will damage the circuit.

What additional circuitry is needed for a voltmeter?

A multiplier resistor in parallel across the component being measured.

What additional circuitry is needed for an ammeter?

A shunt resistor connected in parallel across the galvanometer coil.

What tool is used for high resistance measurement?

Megohmmeter.

What does resolution refer to regarding a multimeter?

It refers to the smallest increment measurable.

What device allows you to analyze multiple alternating current sine waves?

Oscilloscope.