Basic Electronics

Question 1

What is the most important law applicable to study of electricity

Answer 1

Ohms law E =I X R

Question 2

What are the elements of ohms law

Answer 2

Voltage E, current I, resistance R

Question 3

What are the four sources of electrical energy

Answer 3

Thermal, light, pressure, and chemical

Question 4

What does an electrical circuit consist of

Answer 4

A source (battery) ,a resistance or load (lightbulb) conductors (wires)

Question 5

What represents capacitance in an AC circuit

Answer 5

A capacitor

Question 6

What is the function of a capacitor

Answer 6

To store electricity

Question 7

What is the unit of measure for capacitance

Answer 7

Farad

Question 8

What is the standard unit of measure for frequency

Answer 8

Hertz

Question 9

What is the basic component that only allows current to flow in one direction

Answer 9

A diode

Question 10

What is inductance

Answer 10

When voltage is Inducted by magnetic Flux lines in a coil in an AC circuit. The inducted voltage is opposed in direction to the applied voltage and opposes any change in the alternating current

Question 11

What is an example of an inductor in a magneto

Answer 11

The coil

Question 12

What is impendance

Answer 12

The total Opposition for AC to flow caused by a combined affect of resistance inductive resistance and capacitive reactance in an AC circuit

Question 13

What causes opposition to the flow of current in an AC circuit

Answer 13

Inductive, and capacitance reactants

Question 14

What is the unit of measure for impedance

Answer 14

Ohms

Question 15

What is the general purpose of a resistor

Answer 15

To limit current

Question 16

How May the value of small, fixed resistor be determined

Answer 16

By the color band on the resistor

Question 17

What are the two things that happen when current flows through conductor

Answer 17

A magnetic field is generated and a conductor heat up

Question 18

What is the common name for the lines of force that make up the field surrounding the magnet

Answer 18

Magnetic flux lines

Question 19

What is the concept that describes the relationship between electricity and magnetism

Answer 19

Electromagnetism

Question 20

What are the four factors that affect the resistance in electrical current

Answer 20

The wire gauge length temperature and material

Question 21

What is the unit of measurement of power in a DC circuit

Answer 21

The watt. Amperes Times voltage equals watch P= I x E. 746 whats equal 1 Horse power

Question 22

What is a kilowatt

Answer 22

1000 W

Question 23

In a DC circuit, what occurs when voltage is increased while the resistant remains constant

Answer 23

Increase in current

Question 24

What are the three types of DC electrical currents

Answer 24

Siri circuit, parallel circuit, complex circuit

Question 25

A 24 V lead acid battery has how many cells

Answer 25

It has 12 cells and each sale is rated at approximately 2 V

Question 26

What are the units that the battery capacity is measured in

Answer 26

Ampere-hours

Question 27

What should be the specific gravity of the electrolyte in a fully charged lead acid battery

Answer 27

It should be between 1.275 and 1.300

Question 28

What instrument is used to determine the specific gravity of an electrolyte in a lead acid battery

Answer 28

A hydrometer

Question 29

Why can’t a hydrometer not be used to determine the charge of a nickel cadmium battery

Answer 29

The electrolytes in a nickel cadmium battery does not change appreciable during charge or discharge of the battery

Question 30

When using a hydrometer to check the charge of a lead acid battery, at what temperature must a correction factor be applied to the reading

Answer 30

Adjustments must be made if the temperature of the electrolyte is above 90 or below 70°F

Question 31

What is electromagnetic Induction

Answer 31

Transfer of electrical energy by means of a magnetic field. Transferring voltage from one conductor to another without physically touching

Question 32

How are battery compartment protected against corrosion

Answer 32

Coded with a special corrosion resistant paint such as bituminous paint

Question 33

What should be the correct electrolyte levels in a properly service battery

Answer 33

3/8 inches above the plates

Question 34

What are paralleling generators and how is the load distributed

Answer 34

If two or more generators are operated at the same time supply power for a load that must be shared equally

Question 35

Describe a non-tripped circuit breaker

Answer 35

A trip free breaker makes it impossible to hold the circuit closed if it pops with the circuit gets hot you cannot be reset until it gets cold

Question 36

Can you store a NiCad or lead acid battery together

Answer 36

No the fumes can contaminate the electrolyte in the NiCad battery from the lead acid battery

Question 37

What is the result of an in balance to sell in a nickel cadmium battery

Answer 37

When his cell has low internal resistance, current will increase across the cell, causing the heat up

Question 38

What happens to specific gravity of an electrolyte in a lead acid battery when the temperature changes

Answer 38

Reading on the hydrometer will vary with temperature variations For example as the temperature of the electrolyte increases, the specific gravity reading will be high, and cold or electrolytes will have a lower apparent reading

Question 39

What is an L.E.D.

Answer 39

Light emitting diode

Question 40

What is a S.L.A.battery

Answer 40

Sealed lead acid battery

Question 41

What is the basic unit of measure for inductance

Answer 41

Henry

Question 42

What prevents reverse current flow in a D.C.alternator

Answer 42

Reverse current cut out