Basic Electricity Flashcards by Avery Battle

One Kilowatt is equal to how many watts?

1,000 watts

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

Electro-static discharge from the human body during handling

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Describe magnetism

An object’s property which attracts metallic substances

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When the external magnetizing force is removed, what is the difference between permanent and temporary magnets?

Permanent magnets retain their magnetism and temporary magnets rapidly lose their magnetism.

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What makes up an electrical circuit?

A source of electrical energy, a resistance and conductors.

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What law governs the basic study of electricity?

Ohm’s law

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What are the basic elements of ohm’s law?

Voltage(E), resistance(R) and current(I)

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

Current increases

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Ohm’s law expresses as an equation:

E = I x R or Voltage = current x resistance

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Scientifically, power is measured in?

Watts

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Common methods electrical energy can be produced?

Pressure, chemical, thermal and solar

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The law relevant to voltage law?

Kirchoff’s law

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Three types of D.C. electrical circuits?

Series, parallel and series/parallel (complex)

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Types of circuits A&Ps encounter on aircraft?

A combination circuit, series-parallel

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Compare A.C. And D.C. circuits in aircraft

D.C. flows constantly in one direction. A.C. has the ability to change direction at or during regular intervals, is lighter in weight and its voltage can be stepped up or down by using a transformer

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

24 volts, 400 Hz AC current

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

Less than 70F or more than 90F

The function of a capacitor in an AC circuit?

To store electricity

How is capacitance represented in an AC circuit?

By a capacitor

How is inductance represented in an AC circuit?

By a coil

Describe inductance

Inducted voltage which is in the opposite direction of the applied voltage

Properties of an AC circuit which opposes any change in current

Resistance, inductive reactance and capacitive reactance

Describe impedance in an AC circuit

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

What is common use of most multimeters?

Troubleshooting, measuring voltage, resistance, current continuity, capacitance and inductance

Define short circuit

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

Using a multimeter, how would a technician read current?

Inserting the ammeter or multimeter in series by opening or breaking the circuit. The positive side of the meter (red) is connected towards the positive voltage source and negative (black) to negative.

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

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

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

Specific gravity (battery liquid) is between 1.275 and 1.310

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

12 cells

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

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

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

1.25 volts

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

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

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

Yes

How does a capacitor store electricity?

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

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

Clean, dry and neutralize with boric acid or ammonia, then completely air/oven dry

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

Faulty cells or cell imbalance