Chapter4

Question 1

3.75 KW, is how many Watts?

Answer 1

Answer : 3,750 Watts

Step 1 3.75 KW
Step 2 3750 Watts

Question 2

In the circuit below, 1.5 A is the total circuit current. How much current passes thru resistor R2?

Answer 2

Answer : 1.5A

Question 3

In the circuit below (same current calculation as shown in the circuit above), how much is the the voltage drop across R2?

Answer 3

Answer : 7.5V

Question 4

The “Left Hand Rule” is commonly used to determine?

Answer 4

Answer : Used to indicate what path current will flow and the relative direction of a circuit’s magnetic north (using as reference, electron flow notation).

Question 5

Electrical current in a conductor, creates what around the conductor?

Answer 5

Answer : Creates a magnetic (flux) field around the conductor.

Question 6

In the circuit below, three resistors are connected in series. How is the total resistance calculated?

Answer 6

Answer : Resistor values are added together.

Question 7

In the circuit below, how is the circuit’s total current (amperes) calculated?

Answer 7

Answer : I (current) =
E (volts) ÷ R (circuit resistance) = amperes

I (current) = 120V ÷ 80 Ω = 1.5A

Question 8

A solid wire has a diameter of ~ 0.102 inches. The wire has a circular area of approximately how many cmils?

Answer 8

Answer : Chapter 9, Table 8 10380 cmils

Question 9

Voltage drop” is equal to what formula (from the EIR circle)?

Answer 9

Answer : E (voltage drop) =

I (current) x R (resistance)

Question 10

Conduit threads cut in the field must be coated with a compound that is?

Answer 10

Answer : electrically conductive

and non corrosive

Question 11

Can a Master electrician pull a electrical permit?

Answer 11

Answer : NO

Question 12

A electrical circuit operates at 120V with a current of 4A. What is the calculated resistance of the circuit?

Answer 12

Answer : 30 ohms

R = E ÷ I

R = 120V ÷ 4A = 30 ohms