Basic Electronics By Paul Rosenberg

Question 1

What are the three basic factors in circuits.

Answer 1

Force or Voltage
Current Flow
Resistance

Question 2

What is another name for force or voltage?

Answer 2

Electromotive force, symbolized by E, sometimes incorrectly with V.

Question 3

What is the definition of one volt?

Answer 3

One volt is the electromotive force necessary to force one ampere of current to flow through a resistance of one ohm.

Question 4

How is electrical current measured, symbolized, and defined?

Answer 4

Current flow is measured in amperes or amps; symbolized by the letter I— and defined as 6.25 x 10^23 electrons (1 coulomb) per second.

Question 5

How is resistance defined, symbolized and measured.

Answer 5

Resistance is defined as the opposition to current flow; symbolized by the Greek letter omega— and measured in ohms.

Question 6

What is a more modern term for resistance and how is ti symbolized.

Answer 6

Impedance, symbolized by Z.

Question 7

How is an ohm defined.

Answer 7

An ohm is the amount of resistance that will restrict 1 volt of potential to a current flow of 1 ampere.

Question 8

What is Ohm’s Law? What is the equation that expresses it?

Answer 8

“The current in any electrical circuit is equal to the electromotive force (emf or voltage) imposed upon that circuit, divided by the entire resistance of the circuit.”

I=E/R

Where:

I = intensity of current in amperes.
E = emf in volts
R = resistance in ohms

Question 9

How is electrical power defined and what is the symbol used?

Answer 9

Electrical power is expressed as Watts, which is defined as voltage times current; and the symbol used is W or P— the calculation is voltage times current, P=EI.

Question 10

Describe the diagram expressing Watt’s Law formulas.