review DC theory

Question 1

The ? is one of the three main parts of an atom.

Answer 1

proton

Question 2

The proton and electron combine to form the atom’s nucleus.

Answer 2

false

Question 3

Current is defined as the flow of ? through a material.

Answer 3

electron

Question 4

In calculations, current is represented by the letter ?

Answer 4

I

Question 5

The electron has an electrical charge with a(n) ? polarity.

Answer 5

negative

Question 6

Semiconductors have ? electrons in the valence shell.

Answer 6

4

Question 7

A(n) ? is a material whose electrons can be moved with relative ease.

Answer 7

conductor

Question 8

A(n) ? is a material whose electrons strongly oppose movement.

Answer 8

insulator

Question 9

Like charges attract each other and unlike charges repel each other.

Answer 9

false

Question 10

Any current-carrying conductor will create a(n) ? field.

Answer 10

magnetic

Question 11

The primary source of electrical power is ?

Answer 11

magnetism

Question 12

Ohm’s law states that one volt will push one ampere through one ohm of resistance.

Answer 12

true

Question 13

A unit of electrical power is the ? and is represented in equations as the letter P.

Answer 13

watt

Question 14

One horsepower is equal to approximately 746 ?

Answer 14

watts

Question 15

Which of the following formulas is the correct expression of Ohm’s Law for power?

Answer 15

p = e*I

Question 16

The heat produced by the current flowing through the resistance in a circuit is called ? losses.

Answer 16

l^2R

Question 17

Electrical energy use is measured in ampere-hours which involves how much power is used with respect to time.

Answer 17

false

Question 18

When resistors are connected in series, their values are ? to determine total resistance.

Answer 18

added

Question 19

RT = R1 + R2 +…+ RN is the formula for determining the total resistance in a ? circuit.

Answer 19

series

Question 20

What opposes current flow in an electrical circuit?

Answer 20

resistance

Question 21

If the voltage in a given circuit is increased, the current will increase; but if the resistance is increased, then the current will decrease.

Answer 21

true

Question 21

In a circuit, current is directly proportional to voltage and inversely proportional to resistance.

Answer 21

true

Question 21

Which of the following is the correct formula for determining the total current in a circuit?

Answer 21

I = e/r

Question 21

An increase in the total resistance of a series circuit will cause a(n) ? in the current of that circuit.

Answer 21

decrease

Question 21

In series-opposing power sources, the power sources are connected so their polarities are in the same direction.

Answer 21

false

Question 21

The greater the voltage across a fixed resistor, the greater the ? through that resistor.

Answer 21

current

Question 21

As the current flows through each component in a series circuit, it will ?

Answer 21

remain the same

Question 22

In a series circuit, the total voltage source is equal to the algebraic ? of the individual voltage sources.

Answer 22

sum

Question 23

? is a potential difference in electron charges.

Answer 23

voltage

Question 24

Adding additional resistors in parallel with those resistors already existing in a parallel circuit will always decrease the total resistance of the circuit.

Answer 24

true

Question 25

Which of the following is the product-sum formula for determining total resistance in parallel circuits containing two unequal resistances?

Answer 25

r = r1r2/r1+r2

Question 26

Branch currents in a parallel circuit are always less than the total current of the circuit.

Answer 26

true

Question 27

Adding parallel loads to a circuit will increase the total circuit resistance and decrease the total circuit current.

Answer 27

true

Question 28

The ? method is used to determine the total power in a parallel circuit when the power is determined from the total current, total resistance, and source voltage.

Answer 28

direct