Basic Electricity

Question 1

One Kilowatt is equal to how many watts?

Answer 1

1000 watts

Question 2

What is a common cause of damage to solid-state components and /or integrated circuits?

Answer 2

Eletro-Static discharge (ESD) from the human body during handling.

Question 3

Describe magnetism.

Answer 3

An object properties which attracts metalic substances.

Question 4

When the external magneizing force is removed the difference between permanent/temporary magnets.

Answer 4

Permanent magnets retain their magnetism. Temporary magnets rapidily lose magnetism.

Question 5

What makes up an electrical circuit?

Answer 5

A sorce of electrical energy, a resistance(load) and conductors (wires)

Question 6

What law governs the basic study of eletricity?

Answer 6

Ohm’s law.

Question 7

What are the basic elements of Ohm’s law?

Answer 7

E- Voltage, R- Resistance, I- Current.

Question 8

What change occurs in a D.C. circuit when applied voltage is increased & resistance remains constant?

Answer 8

Current increases.

Question 9

Ohms Law expressed as an equation:

Answer 9

E= I x R,
R= E/I,
I= E/R.

Question 10

Scientifically, power is mesured in:

Answer 10

Watts.

Question 11

Common methods electrical energy can be produced:

Answer 11

Pressure (PIZOELECTRIC MATERIALS),
Chemical (BATTERY,
Thermal (THERMOCOUPLES),
Sun Light.
Magnetism

Question 12

The law relevant to voltage law:

Answer 12

Kirchoff’s law.

Question 13

Three types of D.C. Electrical circuits:

Answer 13

Series,
Parallel,
Series/Parallel. (complex)

Question 14

Types of circuits A&P’s encounter on an aircraft:

Answer 14

A combination circuits, series, parallel

Question 15

Compare AC & DC circuits in aircraft:

Answer 15

DC flows constantly in one direction. AC has the abillity to change direction at or during regular intervals, is lighter in weight and it’s voltage can be stepped up and down by using a transformer.

Question 16

How much voltage do most aircraft systems require for special equipment?

Answer 16

Most 24 volts, needs 400Hz AC current.

Question 17

You must apply a correction to the specific gavity that varies between what two values?

Answer 17

When the temperature is less than 70°F or more than 90°F.

Question 18

The function of a capacitor in an AC circuit:

Answer 18

To store eletricity.

Question 19

How is capacitance represented in an AC circuit?

Answer 19

By a Capacitor.

Question 20

How is inductance represented in an AC circuit?

Answer 20

By a coil.

Question 21

Describe inductance:

Answer 21

Inducted voltage which opposite in direction to the applied voltage.

Question 22

Properties of an AC circuit which opposes any change in current?

Answer 22

Resistance, Inductive reactance and Capacitive reactance.

Question 23

Describe impedance in AC circuit:

Answer 23

The total opposition to the current flow_in an AC circuit consisting of either resistance and reactance, or elements of both capacitive or inductive.

Question 24

What is common use of most multimeters?

Answer 24

Troubleshooting and measurements of voltage, resistance, current continuity, Capacitance and inductance.

Question 25

Define Short Circuit:

Answer 25

Low resistance path between two poles (a component and/or a conductor and ground).

Question 26

Using a multimeter, how would a technician read current?

Answer 26

Inserting the ammeter or multimeter in series by opening or breaking the circuit. The positive side of the meter (RED) connected towards the positive voltage source. Negative jack (BLACK).

Question 27

Why would you not perform a specific gravity check of electrolyte NI-CAD battery?

Answer 27

Because the specific gravity does not change with the state of charge.

Question 28

How many cells make up a lead-acid battery rated at 24 volts?

Answer 28

12 cells.

Question 29

When reading specific gravity of a fully charged lead-acid battery, what indicates high state of charge?

Answer 29

Specific gravity (BATTERY LIQUID) between 1.275 and 1.310.

Question 30

What is considered to be the open-circuit voltage of a fully charged 12 cell lead-acid battery?

Answer 30

Approximately 26.4 volts. Or (12 x 2.2 volts) 28 volts are required for charging.

Question 31

What is the open-circuit cell voltage of a NI-CAD battery?

Answer 31

1.25 volts

Question 32

What is a hazard when storing NI-CAD batteries and lead-acid batteries in the same area?

Answer 32

The fumes from one type can contaminate the electrolyte in the other type.

Question 33

Can NI-CAD batteries be interchangeable with lead-acid types?

Answer 33

Yes.

Question 34

How does a capacitor store eletricity?

Answer 34

In the form of an eletrostatic charge or field that exists between two conductors separated by an insulator.

Question 35

What should be done when interchanging a NI-CAD battery with a lead-battery?

Answer 35

Clean, dried & neutralized with Boric acid or ammonia, then completely air/oven dried.

Question 36

What is a probable cause when troubleshooting a NI-CAD battery for falling to deliver its rated capacity?

Answer 36

Faulty cells or cell imbalance.

Question 37

When an aircraft a primary control surfaces are set for a particular phase of flight, such as landing or takeoff, the corresponding control surfaces indicating system will show

Answer 37

A) Trim position B) speed break position C) flap/slat position