Basic Electricity

Question 1

What are the particles that make up an atom? Select all that apply.

a.
Neutron

b.
Molecule

c.
Compound

d.
Proton

e.
Electron

Answer 1

A. Neutron

D. Proton

E. Electron

Question 2

What determines the atomic number of an element?

a.
Number of electrons in the atom

b.
Number of neutrons in the nucleus

c.
Difference in the number of neutrons and electrons

d.
Number of protons in the nucleus

Answer 2

Number of protons in the nucleus

Question 3

What causes the nucleus of an atom to have a positive charge?

a.
The Protons

b.
The electrons

c.
Friction of the electrons

d.
The neutrons

Answer 3

The Protons

Question 4

Why does the electron remain in its orbit and not be pulled into the nucleus?

a.
The outward pull from other atoms

b.
The law of repelling

c.
Opposing magnetic fields

d.
Centrifugal force

Answer 4

D. Centrifugal force

Question 5

What must occur for an atom to become negatively charged?

a.
More electrons than protons.

b.
Less neutrons than protons

c.
less electrons than neutrons

d.
More protons than electrons

Answer 5

A. More electrons than protons

Question 6

What is the name given to an atom with an unbalanced electrical charge?

a.
Quark

b.
Hydrogen

c.
Stray atom

d.
Ion

Answer 6

D. ION

Question 7

According to the “Electron Flow Theory”; in what direction does current flow in a circuit?

a.
Negative to positive

b.
Left to right

c.
Right to left

d.
Positive to negative

Answer 7

D. Negative to positive

Question 8

What type of material will have the most amount of electrons in the outer shell?

a.
Semi-insulator

b.
Insulator

c.
Conductor

d.
Semi-conductor

Answer 8

B. Insulator

Question 9

Identify three materials which are considered good conductors. Select all that apply.

Answer 9

The correct answers are: Silver, Copper, Aluminum

Question 10

What is the best known conductor of electricity?

Answer 10

The correct answer is: Silver

Question 11

How many valence electrons would be found in an atom that is categorized as a semiconductor?

Answer 11

4

Question 12

Which unit of measure is used to describe “Electromotive Force”?

Answer 12

Voltage

Question 13

What does “I” indicate in Ohm’s Law?

Answer 13

Current

Question 14

If the voltage is constant, but the resistance of the circuit is doubled, what would be the effect to current flow?

Answer 14

The correct answer is: It would be reduced by one half

Question 15

Calculate the current through a circuit if it has 50 ohms of resistance and the voltage drop is 24 volts?

Answer 15

I=ER

I=24V50Ω

I = 0.48 A

The correct answer is: 0.48 A

Question 16

Calculate the milli-voltage drop through a circuit if it has 1.5 ohms of resistance and the current flow is 0.25 amps?

Answer 16

E = I x R

E = 0.25 A x 1.5 ohm

E = 0.375 v or 375 mV

The correct answer is: 375

Question 17

What would be the anticipated resistance of a circuit with an EMF of 120 volts and a current of 6 amps?

Answer 17

R=EI

R=120V6A

R = 20 ohms

The correct answer is: 20 ohm

Question 18

Which of the following materials has the highest resistance to current flow?

Answer 18

The correct answer is: Glass

Question 19

Which of the following revolve around the nucleus of an atom?

Answer 19

The correct answer is: Electron

Question 20

At what speed does the impulse of current flow through a conductor?

Answer 20

The correct answer is: 186,000 miles (299,792 kilometers) per second

Question 21

Which method or source of energy may be used to generate electricity?

a.
Heat

b.
All are correct

c.
Friction

d.
Chemical reaction

Answer 21

The correct answer is: All are correct

Question 22

Static electricity Answer____

normally a concern during humid weather.

Answer 22

IS NOT

Question 23

What is the name of the effect that refers to heat being applied to two dissimilar metals or alloys that are joined together that results in current flow?

Answer 23

Thermoelectric effect

Question 24

What are the two practical applications for thermocouples? Select all that apply.

a.
To provide light for maintenance purposes

b.
To generate extra low voltage

c.
To act as a temperature sensor

d.
To ignite pilot gas with hot surface

Answer 24

b.
To generate extra low voltage

c.
To act as a temperature sensor

Question 25

What action occurs when a battery produces electricity?

Answer 25

Electrochemistry is produced when a liquid electrolyte is mixed with other materials to form a paste which allows communication between the anode and the cathode. The cell can then be used in any position and handled as though it was actually dry. Therefore a battery is sometime referred to as a dry cell.

The correct answer is: Electrochemistry

Question 26

What type of appliance is likely to have a piezoelectric igniter? Select all that apply.

a.
Patio heater

b.
Hot water tank

c.
Fireplace

d.
Barbeque

Answer 26

The correct answers are: Hot water tank, Patio heater, Fireplace, Barbeque

Question 27

What are the three common types of materials used to make magnets? Select all that apply.

a.
Iron

b.
Cobalt

c.
Silver

d.
Copper

e.
Aluminum

f.
Nickle

Answer 27

The two types of magnets are, Permanent Magnets and Electromagnets.

The correct answers are: Cobalt, Iron, Nickle