MODULE QUIZ 1

Question 1

the rate of flow of electrons in a conductor. The SI Unit of electric current is the Ampere (A) which dimensionally equivalent to coulomb/second (C/s). The force that acts on the electrons to make them move in a certain direction is known as ELECTROMOTIVE FORCE, and its quantity is known as voltage and is measured in volts.

Answer 1

Electric Current

Question 2

he began to investigate the fundamentals of electromagnetism and conducted a series of experiments on magnetic interactions. As a result of these studies, he developed _________ law, which describes magnetic interactions mathematically.

Answer 2

André-Marie Ampère

Question 3

the positive to the negative terminal and indicates the direction in which positive charges would flow.

Answer 3

Conventional Current Flow

Question 4

negative to positive terminal. Electrons are negatively charged and are therefore attracted to the positive terminal as unlike charges attract.

Answer 4

Electron Flow

Question 5

The work done in moving the electron stream

Answer 5

electrical energy

Question 6

can be converted into other forms of energy such as heat energy, light energy, etc. For example, in an iron box, electric energy is converted to heat energy.

Answer 6

Electrical energy

Question 7

The electric charge flow changes its direction periodically. _________ can be identified in a waveform called a ______. In other words, it can be referred to as a curved line. These curved lines represent electric cycles and are measured per second. The measurement is read as Hertz (Hz).

Answer 7

Alternating current (AC)
SINE WAVE

Question 8

The most commonly used and most-preferred electric power for household equipment, office, buildings, etc.

Answer 8

AC

Question 9

The flow of direct current does not change periodically. The current electricity flows in a single direction in a steady voltage. The major use of _____is to supply power to electrical devices and also to charge batteries. _____ has the combination of a plus and a minus sign, a dotted line or a straight line.

Answer 9

Direct current (DC)

Question 10

the most commonly used in everything that runs on a battery and uses an AC adapter while plugging into a wall or uses a USB cable for power relies on DC such as mobile phone batteries, flashlights, flat-screen television and electric vehicles.

Answer 10

DC

Question 11

flow only in one direction

Answer 11

direct current

Question 12

flows in two directions

Answer 12

alternating current

Question 13

seldom used as a primary energy source in industries.

Answer 13

Direct current

Question 14

It is mostly used in low voltage applications such as charging batteries, aircraft applications, etc..

Answer 14

Direct current

Question 15

uses a needle that moves along a scale to indicate the value of the measurement.

Answer 15

analog multimeter

Question 16

uses a numeric display to show the exact value of the measurement.

Answer 16

Digital Multimeter

Question 17

a measure of the opposition to the flow of current in an electrical circuit. It is influenced by the material’s properties, length, cross-sectional area, and temperature. While the electric potential difference established between the two terminals encourages the movement of charge, it is resistance that discourages it. The rate at which charge flows from terminal to terminal is the result of the combined effect of these two quantities.

Answer 17

Resistance

Question 18

is an intrinsic property of a material, independent of its shape or size.

Answer 18

Resistivity

Question 19

The resistance of an object depends on its shape and the material of which it is composed. The cylindrical resistor in the next figure is easy to analyze, and, by so doing, we can gain insight into the resistance of more complicated shapes.

Answer 19

true

Question 20

states the relationship between electric current and potential difference. The current that flows through most conductors is directly proportional to the voltage applied to it.

Answer 20

Ohm’s Law

Question 21

a German physicist was the first to verify Ohm’s law experimentally.

Answer 21

Georg Simon Ohm

Question 22

“Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperatures remain constant.”

Answer 22

TRUE

Question 23

The rate at which the system loses potential energy as the charge passes through the resistor is equal to the rate at which the system gains internal energy in the resistor.

Answer 23

Electrical Energy

Question 24

The unit of energy used by electric companies to calculate consumption, the kilowatt-hour, is defined in terms of the unit of power and the amount of time it’s supplied. One kilowatt-hour (kWh) is the energy converted or consumed in 1hr at the constant rate of 1kW. It has the numerical value

Answer 24

Electrical Power

Question 25

On an electric bill, the amount of electricity used in a given period is usually stated in multiples of kilowatt-hours.

Answer 25

true

Question 26

a record of the electric pulses accompanying the beating of the heart, It shows the pulses generated by the brain.

Answer 26

electrocardiogram (ECG)

Question 27

Contrary to the belief of most, 75 V is just as lethal as 750 V. The real measure of a shock's intensity lies in the amount of current forced through the body and not the voltage. Thus, any electrical appliance in the house can, under certain conditions transmit a fatal current.

Answer 27

true

Question 28

Always remember, low voltage does not imply low hazard.

Answer 28

true

Question 29

Three primary factors affect the severity of the shock a person receives when he or she becomes part of the circuit.​ - amount of current through the body (usually measured in amperes);​ - path of the current through the body; and​ - length of time the body in the circuit.

Answer 29

true

Question 30

Perception level. Slight tingling sensation. Still dangerous under certain conditions.

Answer 30

0.001

Question 31

Slight shock felt; not painful but disturbing. Average individual can let go. However, strong involuntary reactions to shocks in this range may lead to injuries.

Answer 31

0.005

Question 32

Painful shock, muscular control is lost. This is called the freezing current or "let go" range.

Answer 32

0.006 to 0.03

Question 33

Extreme pain, respiratory arrest, severe muscular contractions. Individual cannot let go. Death is possible.

Answer 33

0.05 to 0.15

Question 34

Ventricular fibrillation, the rhythmic pumping action of the heart ceases. Muscular contraction and nerve damage occur. Death is most likely.

Answer 34

1.0 to 4.30

Question 35

Cardiac arrest, severe burns and probable death.

Answer 35

10.0