ECET 201 Midterm

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A four-color resistor has the color-code red-violet-orange-gold. If it is placed across a 12 V source, the expected current is

0.44 mA

The smallest power rating you should use for a resistor that is 330 W with 12 V across it is

1/2 W

A battery rated for 20 Ah can supply 2 A for a minimum of

10 hours

The power dissipated by a light operating on 12 V that has 3 A of current is

36 W

If the current in a 330 W resistor is 15 mA, the applied voltage is approximately

5.0 V

A four-color resistor with the color bands gray-red-black-gold is

82

The unit of measurement for current is the:

AMP

A series circuit has the same voltage across every component

False

A series connection provides two or more paths for current to flow

False

A short could best be described as a unintended path for voltage

False

An electronic device which stores an electric charge is known as an inductor

False

Assembly diagrams show how to connect components electrically

False

Efficiency is determined by dividing the power output by the power input

False

Electrons are negatively charged particles, and are contained in the nucleus of the atom

False

If 50 Joules are used in ten seconds, the power will be 500 Watts

False

In a series circuit, current is not the same when measured at different points in the circuit

False

Increasing voltage while maintaining the same resistance will cause current to decrease

False

Inductors store energy in an electrostatic field

False

Observed voltages not being shared identify components in parallel in a series-parallel

False

Resistors normally short when they burn out

False

The copper atom contains 29 free electrons

False

The movement of electrons between two points is called voltage

False

The nucleus contains protons and electrons, each with an opposite charge

False

The power dissipated by a resistor doubles if the applied voltage doubles

False

The process of gaining a valence electron is known as ionization

False

The product of all the voltage drops in a series circuit will equal source voltage

False

The total resistance of a series circuit is equal to the average of all the resistance values

False

The unit of measurement for conductance is the coulomb

False

The voltage across a circuit resistance is inversely related to the current through that resistance

False

Voltage forces electrical energy through a circuit

False

When a load resistor is connected across a voltage divider output, the output voltage increases

False

A mathematical relationship between current, voltage, and resistance was determined by

George Ohm

The symbol for current is:

I

The SI unit of energy is the

Joule

The symbol for power is:

P

The symbol for charge is

Q

If the voltage in a resistive circuit is doubled, the power will be

Quadrupled

A 1 kW load that operates for 1 hour consumes the same amount of energy as a 100 W load that operates for 10 hours

True

A change in voltage will result in a linearly proportional change in current

True

A junction is any point in a circuit where two or more circuit paths come together

True

A loaded voltage divider is a common application of a series-parallel circuit

True

A parallel circuit is also used as a current divider

True

A parallel connection provides two or more paths for current to flow

True

A series-parallel circuit is a combination of both series and parallel paths

True

A voltage divider is a series arrangement of resistors

True

As you add resistors to a series circuit, total current will decrease

True

Current value depends on the amount of charge moving past a point in a unit of time

True

Each resistor in a parallel circuit demands a current (I = V/R), and is independent of all other resistors in parallel with it.

True

Energy is the ability to do work

True

Ground is a common reference point in a circuit

True

If one of the resistors opens in a parallel circuit, total resistance of the circuit will increase

True

In the neutral state all atoms contain the same number of protons and electrons

True

Kilo equals 1,000 times the base unit

True

One watt equals one joule per second

True

Open circuits and short circuits are typical circuit

True

Parallel components in a series-parallel circuit may be in parallel with other individual components, or with other combinations of components

True

Power is the rate at which energy is used

True

Series components in a series-parallel circuit may be in series with other components, or with other combinations of components

True

The current entering a point in a circuit is equal to the current leaving the point

True

The outermost shell of an atom is called the valence shell

True

The rate at which work is performed is called power

True

The smallest particle of an element that still retains the characteristics of the element is called an atom.

True

The symbol μ is an abbreviation for 10-6 or micro

True

The total (equivalent) resistance in a parallel circuit is always less than the lowest value resistor

True

The total power taken from the power supply, and dissipated by the resistors in a parallel circuit, is the sum of the powers dissipated by each resistor in the circuit

True

The voltage drop across each resistance in a parallel circuit is equal to the supply voltage

True

Troubleshooting is the process of identifying and locating a fault in a circuit

True

Valence electrons are tightly bound in insulators

True

When parallel resistors are of three different values, the smallest resistor will dissipate the greatest amount of power

True

When two or more components are connected across the same voltage source, they are in parallel

True

The symbol for voltage is:

V

If three equal resistors are in series, the total resistance is

WHO ****ING KNOWS

A unit of power is the

Watt

In a series circuit with more than one resistor, the current is

always the same in all resistors

The circular mil is a unit of

area

A battery stores

chemical energy

The atomic particle responsible for electrical current in solid metallic conductors is that

electron

Valence electrons are

electrons in the outermost shell involved in chemical reactions loosely bound

In any circuit the total current entering a junction is

equal to the total current leaving the junction

The current in a certain 4-band resistor is 22 mA when the voltage is 18 V. The color bands on the resistor are

gray-red-brown-gold

A troubleshooting method that starts in the middle and works toward a fault is

half-splitting

For constant voltage in a circuit, doubling the resistance means

halving the current

Holding the voltage constant, and plotting the current against the resistance as resistance is varied will form a

hyperbola

In a closed loop, the algebraic sum of all voltages (both sources and drops)

is zero

In a series circuit with more than one resistor, the voltage is

larger across larger resistors

A series circuit cannot have

more than one path

If three equal resistors are in parallel, the total resistance is

one third the value of one resistor

A 330kW+- 5% resistor has the color bands

orange-orange-yellow-gold

The efficiency of a power supply is determined by

output power divided by input power

The atomic number is the number of

protons in the nucleus

Two circuits that are equivalent have the same

response to an electrical stimulus

The unit of conductance is the

siemen

When the current is plotted against the voltage for a fixed resistor, the plot is a

straight line with a positive slope

The total power dissipated in a parallel circuit is equal to the

sum of the power in all resistors

The total power dissipated in a series circuit is equal to the

sum of the power in all resistors

The power rating of a resistor is determined mainly by

surface area

Before troubleshooting a faulty circuit you should find out

the conditions that existed when it failed the symptoms of the failure if the circuit ever worked

The total resistance of parallel resistors is equal to

the sum of the reciprocals of the resistances

If a series equivalent circuit is drawn for a complex circuit, the equivalent circuit can be analyzed with

the voltage divider theorem

The number of nodes in a parallel circuit is

two nodes


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