Electrical

Question 1

Main panel box amp sizes?

Answer 1

100, 150, and 200 amps

Question 2

What are the four main types of electrical injuries?

Answer 2

Electrocution, electric shock, burns, falls

Question 3

Problems arise in equipment when there is a breakdown of insulation due to what?

Answer 3

Wear and tear, defective construction, misuse of equipment

Question 4

What are the two types of electricity?

Answer 4

AC, DC

Question 5

How do you make AC?

How do you make DC?

Answer 5

AC: Gererators

DC: Batteries, static, and lightning

Question 6

At what frequency is AC in the US?

At what frequency is AC outside US?

Answer 6

60hz, 50hz

Question 7

Ohms law defines the relationship between?

Answer 7

(P) power
(E) voltage
(I) current
(R) resistance

Question 8

What is 1 ohm?

Answer 8

The resistance value in which 1 volt will maintain current of 1 amp

Question 9

Resistance determines what?

How is it measured?

Answer 9

How much current will flow through a component.

In Ohms

Question 10

Resistors are used for what?

Answer 10

Control voltage and current levels

Question 11

What is power?

Answer 11

The amount of current x voltage at a given point measured in watts/ wattage

Question 12

What is current?

How does it flow?

How is it measured?

Answer 12

Is what flows in a wire or conductor

Flows from neg to pos

Measured in amps

Question 13

What is voltage?

How is it measured?

Answer 13

Difference in electrical potential between 2 points in a circuit.

Measured in volts.

Question 14

How many watts is 1 hp?

1hp is equal to how much ft lb / min?

Answer 14

750 watts

33,000 ft lb/ min

Question 15

What is the west virginia formula?

Answer 15

Watts= volts x amps
(W)=(v)(a)
v=w/a
a=w/v

Question 16

Ground guage (copper) service sizes.

Answer 16

8-100a
6-125a
4-165a
3-200a

Question 17

4 important “musts” for grounding rod

Answer 17

1/2” diameter
Must be no less than 8’ in length
Must be in ground at least 8’
Installed below permanent moisture level

Question 18

What is bonding?

Answer 18

Permanent joining of metallic parts to form an electrically conductive path.

Question 19

Why bond?

Answer 19

Establish effective path for fault current

To facilitate the operation of the over current device.

Question 20

What are the wire gauge sizes?

How many amps are each rated for?

Answer 20

14ga-15amps
12ga-20amps
10ga-30amps
8ga-40amps
6ga-50amps

Question 21

How to determine amps required?

Answer 21

Watts / volts (110 or 240) round up

Question 22

What must you know when installing branch circuits?

Answer 22

# of loads on circuit
Watts on each load
Amps required by each load
Voltage required by the load
Distance from service panel to load