Worksheet 1-Basic DC Electrical Terms

Question 1

What part of an atom is associated with the flow of electricity?

Answer 1

The electrons located in the outer valance orbits of atoms are associated with current flow.

Question 2

What in electrons in a conductor determines whether its flow is poor or good?

Answer 2

Whether or not there are free electrons in the orbits of atoms. A good conductor requires many free electrons.

Question 3

Define static electricity.

Answer 3

Static electricity is the difference of electrical charge between two non-conductive surfaces.

Question 4

What term is used to express the amount of flow of electricity?

Answer 4

Amperes is the amount of current flowing past a particular point in a circuit.

Question 5

Define Coulomb.

Answer 5

The basic unit of electrical quantity equal to 6.28 x 10^18, or 6.28 billion billion electrons.

Question 6

What is the basic unit of electrical pressure? What other names could it go by?

Answer 6

Electromotive Force, EMF or Volts

Question 7

If voltage and resistance are known, describe how total current can be determined. Show the equation.

Answer 7

To determine current in a circuit, voltage is divided by the resistance.

Question 8

What device other than an actual battery can be used to store energy?

Answer 8

A capacitor

Question 9

Describe the left hand rule as it pertains to electrical generation.

Answer 9

This describes the flow of current in a conductor when pass through magnetic lines of flux. The thumb represents the motion of the conductor; the index finger represent the line of flux of the magnetic field, and the middle finger is the resultant current flow.

Question 10

What trait would allow magnetic lines of flux to flow easily?

Answer 10

The easy of which the lines of flux follow the material is determined by the permeability of the material that the lines of flux are directed to flow through.

Question 11

Describe the name of a common electrical point that allows circuits to have a return path to power.

Answer 11

To save wires, all return paths to the negative electrical potential by using an earth or chassis ground.

Question 12

What is the result of passing too much current (amps) in too small gauge of wire?

Answer 12

A larger amount of resistance will slow the rate of current flow.

Question 13

Describe the electrical relationship of voltage, current and resistance per Ohm’s law.

Answer 13

Ohm’s law states that an electrical pressure of 1 volt is equal to the flow of 1 amp of current times a resistance of 1 ohm.

Question 14

How much work can be achieved with 1 watt of power?

Answer 14

One watt of energy is equal to 1/746 of a horsepower.

Question 15

Describe what current does in a series circuit.

Answer 15

The flow of current is the same across all points (resistance loads) around the circuit.

Question 16

How is voltage distributed in a parallel circuit?

Answer 16

In a parallel circuit, voltage is equally distributed in all branches of the circuit while total current is the sum of all individual branch currents.

Question 17

Describe the rule for current and magnetism for the left hand rule for generators.

Answer 17

Thumb=direction of motion of conductor
Index Finger=direction of the magnetic field
Middle finger=resultant current flow

Question 18

What large difference of electrical potential has no useful purpose in aviation?

Answer 18

Static electricity has no useful purpose in aviation.

Question 19

What is the property called when lines of magnetic flux travel freely through a materials?

Answer 19

Only materials that have high permeability will pass lines of magnetic flux.

Question 20

What is the basic unit of measure for a capacitor?

Answer 20

The basic unit of measure for a capacitor is a Farad.

Question 21

Which type of battery cannot be recharged in a circuit?

Answer 21

A battery that is called a primary cannot be recharged while a secondary can be.