Tech Bowl - Electricity

What is the unit of electrical power?

watt

Which of the following is a two terminal device which permits current to flow in only one direction?

diode

In 1911, Kammerlingh Onnes, a Dutch scientist, discovered what electrical device?

superconductor

What is a charge in motion referred to as?

current

What electrical item is calculated by the product of the resistance times the current squared (R \* I^2)?

power

An intrinsic conductor is also known as a(n) :

semiconductor

Which Italian scientist developed the battery?

Alessandro Volta

\___________ charges are at rest.

electrostatic

DC and AC stand for :

Direct Current and Alternating Current

P–type semiconductors have an abundance of \___________ charge carriers.

positive

Who first discovered the relationship between electricity and magnetism by deflecting a compass point with an electric current?

Hans Christian Oersted

What is a charged atom called?

ion

An alternator generates ______________ by rotating a loop of wire between the poles of a permanent magnet.

current

In logic circuits, if one input is on and the other input is off, what is the result of an OR gate?

on

In 1948, the transistor was invented by :

Bell Laboratories

The \___________ is the metal strip in a DC motor that picks up the current.

commutator

What is the unit of measurement by which electric bills are calculated?

kilowatt–hour

The process of adding impurities to a crystal is :

doping

Which of the following scientists discovered electromagnetic induction?

Michael Faraday

When current goes through a wire, a(n) \_____________ is created.

magnetic field

What is the storage of electric charge?

capacitance

Switching circuits or \______________ perform repetitive operations.

digital integrated circuits

Which of the following scientists discovered that lightning is a form of electricity?

Benjamin Franklin

What is a positively charged ion?

cation

What is the unit of capacitance?

Farad

Which of the following electrical components is responsible for the miniaturization of electronic equipment?

integrated circuits

The time required for a capacitor to charge or discharge is dependent on the _____________in the circuit.

resistance

What is the name for the positive electrode?

anode

A piece of wire designed to melt when current flowing through reaches a certain value is a(n) :

fuse

What is the ability of a battery to deliver power over a given time?

battery rating

Amplifying and switching are two popular uses for what solid–state device?

transistor

What removes unwanted frequency components of an electrical signal?

capacitor

From the schematic diagram shown, determine the current flow through resistor R2. Assume the circuit is in steady state.

2.5 mA

The ____________ of a diode is the max current that the device can conduct for a partial cycle of operation.

peak rectified current

_________________ is an electronic component capable of change from response in an external signal.

active device

Metal conducts electricity better as it becomes :

colder

A(n) \_______ coil produces high voltage from a low one.

induction

In logic gates, if one input is on and the other is off, what is the result of a NAND gate?

on

A(n) \______________ is a coil of wire wound around a core of magnetic material.

electromagnet

A quantitative measure of an electric charge is a(n) :

coulombs

Which of the following causes static electricity?

friction

What is the main part of an electrical amplifier?

transistor

An alternate path in a circuit is a(n) :

shunt

A(n) \_____________ is a solution of acid and water.

electrolyte

When AC is converted to DC, it is said to be :

rectified

In logic circuits, if one input is on and the other input is off, what is the result of a NOR gate?

off

The property of a circuit that opposes a change in voltage in a circuit is :

capacitance

The production of electricity in a material through the application of pressure is said to be the:

piezo electric effect

Which of the following laws states that the current in a parallel circuit is equal to the sum of the current in its branches?

Kirchoff's Current Law of Parallel Circuits

Base, emitter, and collector are the three connections to a(n) :

transistor

Which of the following is a known shield against magnetism?

no know shield exists

Converting energy from one form to another is :

transducing

The basic instrument used to measure AC signal voltages and waves is the :

oscilliscope

What type of semiconductor has an abundance of electrons as carriers?

n–type

What law states that the voltage across all branches of a parallel circuit are equal?

Kirchoff's Voltage Law

A popular way to find an unknown resistance in a circuit is with a(n) :

ohm meter

The working voltage direct current is the voltage at which a(n) __________ can withstand without destruction to the dielectric.

capacitor

What are the impurities added to semiconductors called?

dopants

Of the following wire sizes, which is the largest?

6 awg

A(n) ___________ is whenever electrons are allowed to return to the source without passing through the complete circuit.

short circuit

What type of wave represents alternating current?

sine wave

What type of diode is purposely manufactured to operate in the reverse direction?

zener

A popular mathematical equation to solve for current, voltage, and resistance is :

Ohm's law

The _____________ of a conductor is influenced by material type, size, length, and temperature.

resistance

Which of the following is a rotating machine which converts mechanical energy to electrical energy?

dynamo

SSI, MSI, LSI, and VLSI are ways of classifying the component density of :

integrated circuits

What is the free movement of electrons in an electric field?

conduction

Low wattage resistors are generally labeled by a(n) :

color codes

From the schematic diagram shown, determine the voltage across resistor R1. Assume that the circuit is in steady state.

2.5 V

The \________________ replaced the vacuum tube in electrical and electronic devices.

transistor

_____________ is the measure of resistance that relates purely to the properties of the material.

resistivity

The ________________ is determined by the number of turns of wire, the current in the wire coil, the core material, and the ratio of the coil diameter to the coil length.

strength of an electromagnet

\____________ is equal to 6.24 x 10e18 electrons.

1 Coulomb

In diodes, _______________ is the maximum voltage that can be applied to the diode in the reverse direction without destroying it.

Peak Inverse Voltage

What is an electrical switch that can be operated either magnetically or electrically?

relay

A relay is an example of a(n) \_________ switch.

magnetic

When a person is shocked, the cause of the damage is the :

electric current

The reverse bias voltage at which the conduction suddenly increases in a diode is the :

avalanche voltage

Something in a circuit that uses electric current is a(n) :

load

______________ happens when two coils are close enough to each other that the magnetic field of one cuts across the windings of the other coil.

mutual induction

Battery ratings are generally measured in :

ampere–hours

ROM that can be erased and programmed as needed is :

EPROM

What is the insulating medium between the parallel plates of a capacitor known as?

dielectric

What is a piece of metal used to carry away heat from an electronic component?

heat sink

The basis behind a transformer is :

mutual induction

Which of the following electronic terms is short for "transfer resistor"?

transistor

What device is used to store an electric charge on two plates parallel to each other?

capacitor

What is the rotating coil in a motor?

armature

Which of the following electrical devices are used for preventing excessive voltages or currents from overloading circuits?

fuses and circuit breakers

In logic gates, if one input is on and the other is off, what is the result of an AND gate?

off

What part of a bell assembly causes the bell to ring when activated?

electromagnet

In a circuit, there is a load rated at 10 ohms and a battery rated at 5 amps connected in series. What is the voltage in the circuit?

50 V

What is the typical frequency of AC electricity in the United States?

60 Hz

What is the negative electrode called?

cathode

Which of the following is a variable resistor?

potentiometer

\___________________ states that current is the same for all points in a series circuit.

Kirchoff's Current Law for Series Circuits

The total resistance in a parallel circuit ___________ the value of any single resistor in the circuit.

is less than

A dual in–line package switch is commonly called a(n) \_________ switch.

DIP

What is a four part resistor circuit that can measure the resistance of an unknown resistor?

wheatstone bridge

_____________ is a negatively charged ion.

Anion