Video Notes: Electronics Fundamentals (Capacitance, Inductance, Batteries, and DC/AC Concepts)

A comprehensive set of practice flashcards covering capacitance, inductance, transformers, AC/DC concepts, battery technology, and basic circuit theory.

What is the total capacitance of a circuit containing three capacitors with capacitances of 0.02 µF, 0.05 µF, and 0.10 µF, respectively?

0.0125 µF

The basis for transformer operation in the use of alternating current is mutual?

Inductance

Convert farads to microfarads by?

Multiplying farads by 10^6

Capacitors are sometimes used in DC circuits to?

Smooth out slight pulsations in current/voltage

Convert farads to picofarads by?

Multiplying farads by 10^12

What factors strengthen a coil inductor?

Adding coils close together

Electrostatic fields are also known as?

Dielectric fields

Which effect does not apply to the movement of electrons flowing in a conductor?

Static energy

What will a voltmeter read if properly connected across a closed switch in a circuit with electrical power on?

Zero voltage

Which of the following is commonly used as a rectifier in electrical circuits?

Diodes

In a parallel circuit with four 6-ohm resistors across a 24-volt battery, what is the total voltage across resistor-three (VR3) in the circuit?

24 volts

The term that describes the combined resistive forces in an AC circuit is?

Impedance

When inductors are connected in series in a circuit, the total inductance is?

Equal to the sum of the individual inductances

An increase in which of the following factors will cause an increase in the inductive reactance of a circuit?

Inductance and frequency

When different rated capacitors are connected in parallel in a circuit, the total capacitance is?

Equal to the sum of all the capacitances

The correct way to connect a test voltmeter in a circuit is?

In parallel with a unit

Which term means .001 ampere?

Milliampere

A 24-volt source is required to furnish 48 watts to a parallel circuit consisting of four resistors of equal value. What is the voltage drop across each resistor?

24 volts

The potential difference between two conductors which are insulated from each other is measured in?

Volts

The amount of electricity a capacitor can store is directly proportional to?

Plate area and inversely proportional to the distance between the plates

The working voltage of a capacitor in an AC circuit should be?

At least 50 percent greater than the highest applied voltage

What is the total capacitance of a circuit containing three capacitors with capacitances of 0.25 µF, 0.03 µF, and 0.12 µF, respectively?

0.4 µF

Which requires the most electrical power during operation?

Two lights requiring 3 amperes each in a 24-volt parallel system

Unless otherwise specified, any values given for current or voltage in an AC circuit are assumed to be?

Effective values

The opposition offered by a coil to the flow of alternating current (ignoring resistance) is called?

Inductive reactance

A 14-ohm resistor is to be installed in a series circuit carrying 0.05 ampere. How much power will the resistor be required to dissipate?

At least 35 milliwatts

A cabin entry light of 10 watts and a dome light of 20 watts are connected in parallel to a 30-volt source. If the voltage across the 10-watt light is measured, it will be?

Equal to the voltage across the 20-watt light

Which of the following statements is/are generally true regarding the charging of several aircraft batteries together?

1 and 2

The method used to rapidly charge a nickel-cadmium battery utilizes?

Constant voltage and varying current

The purpose of providing a space underneath the plates in a lead acid battery’s cell container is to?

Prevent sediment buildup from contacting the plates and causing a short circuit

Which condition is an indication of improperly torqued cell link connections of a nickel-cadmium battery?

Heat or burn marks on the hardware

The presence of any small amount of potassium carbonate deposits on the top of nickel-cadmium battery cells in service is an indication of?

Normal operation

What is the likely result of servicing and charging nickel-cadmium and lead-acid batteries together in the same service area?

Contamination of both types of batteries would occur

The electrolyte of a nickel-cadmium battery is the lowest when the battery is?

In a discharged condition

During discharge, nickel-cadmium batteries will show a lower liquid level than when at full charge because?

The electrolyte becomes absorbed into the plates

What may result if water is added to a nickel-cadmium battery when it is not fully charged?

Excessive spewing is likely to occur during the charging cycle

In nickel-cadmium batteries, a rise in cell temperature?

Causes a decrease in internal resistance

Which statement regarding the hydrometer reading of a lead-acid storage battery electrolyte is true?

The hydrometer reading does not require a temperature correction if the electrolyte temperature is 80°F

A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because?

Most of the acid is in the solution

What determines the amount of current which will flow through a battery while it is being charged by a constant voltage source?

The ampere-hour capacity of the battery

How can you find the polarity of an electromagnet?

Use the left-hand rule

What is meant by a kilowatt?

1,000 watts

What happens to the current in a DC circuit if the voltage is increased but the resistance remains the same?

The current increases

What are three types of DC circuits?

Series, parallel, and series-parallel

How many ohms are in a megohm?

One million (1,000,000)

What part of an amp is a milliamp?

One thousandth (0.001)

What precautions should be taken in a maintenance shop where both lead-acid and nickel-cadmium batteries are serviced?

Keep them separate and do not share tools

A thermal switch, or thermal protector, as used in an electric motor, is designed to?

Open the circuit to allow cooling of the motor

If electrolyte from a lead-acid battery is spilled in the battery compartment, which procedure should be followed?

Apply sodium bicarbonate solution followed by a water rinse

What is used to neutralize spilled electrolyte from a nickel-cadmium battery?

A solution of boric acid and water

The electrolyte of a nickel cadmium battery is highest when the battery is?

In a fully charged condition

In a parallel circuit with three 6-ohm resistors across a 12-volt battery, what is the total current (It) value in the circuit?

6 amps

What is the purpose of a capacitor?

To store electrical energy in electrostatic fields

What is the basic unit of capacitance?

The farad

Why should electrolytic capacitors not be used in an AC circuit?

They are polarized

What is meant by inductance?

The ability to store electrical energy in electromagnetic fields

What is the basic unit of inductance?

The henry

What is meant by impedance?

The total opposition to the flow of alternating current

In what units is impedance measured?

Ohms

What is the specific gravity of the electrolyte in a fully charged lead-acid battery?

Between 1.275 and 1.300

How many cells are there in a 24-volt lead-acid battery?

12

What is the range of temperatures of the electrolyte in a lead-acid battery that does not require a correction when measuring its specific gravity?

70°F to 90°F

What instrument is used to measure the specific gravity of the electrolyte in a lead-acid battery?

A hydrometer

How is a lead-acid battery compartment treated to protect it from corrosion?

Paint with asphaltic paint or polyurethane enamel

What is used to neutralize spilled electrolyte from a lead-acid battery?

Bicarbonate of soda and water

How high should the electrolyte level be in a properly serviced lead-acid battery?

Only up to the level of the indicator in the cell

Why is a hydrometer not used to measure the state of charge of a nickel-cadmium battery?

Because its specific gravity does not change appreciably

The voltage drop in a circuit of known resistance is dependent on?

The amperage of the circuit

Which is correct in reference to electrical resistance?

If one of three bulbs in a parallel lighting circuit is removed, the total resistance increases

What happens to the current in a voltage step-up transformer with a ratio of 1 to 4?

The current is stepped down by a 1 to 4 ratio

Which of these will cause the resistance of a conductor to decrease?

Decrease length or increase cross-sectional area

A 48-volt source is required to furnish 192 watts to a parallel circuit consisting of three resistors of equal value. What is the value of each resistor?

36 ohms

Forward biasing of a solid-state device will cause the device to?

Conduct

Through which material will magnetic lines of force pass most readily?

Iron

When referring to an electrical circuit diagram, what point is considered to be at zero voltage?

The ground reference