Electrical Engineering 2 Flashcards

Questions and Answers

What is a henry?

A unit of inductance (correct)

A unit of power

A unit of frequency

A unit of resistance

What is a hertz?

A unit of measure for frequency

What does impedance measure?

The opposition a circuit presents to a current

Inductance is measured in henry.

True Signup and view all the answers

What is an inductor?

A coil of wire wrapped around an iron core Signup and view all the answers

What materials are considered insulators?

All of the above Signup and view all the answers

What is the function of an inverter?

Converts direct current to alternating current Signup and view all the answers

One kilowatt-hour (kWh) is the product of power in kW and time in ______.

hours Signup and view all the answers

What does a kilowatt-hour meter measure?

Electrical energy use Signup and view all the answers

How many watts are in one kilowatt?

1000 watts Signup and view all the answers

What is the definition of load in electrical terms?

Anything that consumes electrical energy Signup and view all the answers

What does load rejection refer to?

Sudden loss of load in a system Signup and view all the answers

What is mutual induction?

Occurs when changing current in one coil induces voltage in a second coil Signup and view all the answers

What is ohm's law?

V = IR Signup and view all the answers

What does an ohmmeter measure?

Resistance in ohms Signup and view all the answers

An open circuit occurs when there is a break in the circuit.

True Signup and view all the answers

What is a parallel circuit?

A circuit with multiple paths for electricity to flow Signup and view all the answers

What does polarity refer to?

The positive and negative ends of a magnet or electrical component Signup and view all the answers

What is power measured in?

Watts Signup and view all the answers

What is reactive power?

Electricity that establishes and sustains electric and magnetic fields in AC equipment. Signup and view all the answers

What is a rectifier?

A device that converts AC to DC Signup and view all the answers

What does a relay do?

Controls a larger current using a small current Signup and view all the answers

What is the definition of resistance?

The opposition to the passage of electric current Signup and view all the answers

What is a resistor?

A device that presents resistance to current flow Signup and view all the answers

What does the rotor refer to in an electrical machine?

The rotating part Signup and view all the answers

Self induction occurs when there is a change of ______ in a coil.

current Signup and view all the answers

A semiconductor has conductivity between that of an insulator and ______.

most metals Signup and view all the answers

What is a series-parallel circuit?

A combination of series and parallel connections Signup and view all the answers

What does a short circuit refer to?

When part of a circuit comes in contact with another part Signup and view all the answers

What defines a solid-state circuit?

Utilizes semiconductor devices Signup and view all the answers

What is a transistor?

A three connection semiconductor device Signup and view all the answers

What is true power measured in?

Watts Signup and view all the answers

What unit measures reactive power?

VARS Signup and view all the answers

What is a variable resistor?

A resistor that can be adjusted Signup and view all the answers

What is volt-ampere (VA)?

A measure of electrical power Signup and view all the answers

What is a volt?

A unit of measure of voltage Signup and view all the answers

What does voltage measure?

Electromotive force causing electron flow Signup and view all the answers

What is a voltmeter used for?

Measuring voltage in volts Signup and view all the answers

What does watt-hour (Wh) measure?

A unit of electrical energy Signup and view all the answers

What is a watt?

A unit of electrical power Signup and view all the answers

What does a wattmeter measure?

Electric power in watts Signup and view all the answers

What does the term waveform refer to?

A graphical representation of electrical cycles Signup and view all the answers

Study Notes

Electrical Engineering Key Terms

Henry: Unit of inductance; 1 henry is the inductance causing 1 volt emf with a current change of 1 ampere per second.
Hertz: Unit of frequency, replacing 'cycles per second' (cps).
Impedance: Total opposition in a circuit to AC current, comprising both magnitude and phase components.
Inductance: Property allowing a conductor to induce voltage due to changing current; includes self-inductance and mutual inductance. Measured in henries (H).
Inductor: Coil of wire, typically around an iron core; inductance increases with more turns in the coil.
Insulator: Material that restricts electric current flow; includes glass, rubber, air, and plastics, which protect against electric shock.
Inverter: Device that converts direct current (DC) to alternating current (AC).
Kilowatt-hour (kWh): Energy measurement unit; calculated by multiplying power (in kW) by time (in hours). Example: A 100W bulb uses 0.4 kWh in 4 hours.
Kilowatt-hour Meter: Device for measuring electrical energy consumption.
Kilowatt (kW): Unit equivalent to 1000 watts.
Load: Electrical energy consumer, including lights, motors, and transformers.
Load Rejection: Occurs when there’s a sudden load loss, causing generator frequency increase. Load rejection tests verify system stability post-loss.
Mutual Induction: Process where changing current in one coil generates voltage in another nearby coil.
Ohm (Ω): Unit of resistance; 1 ohm resists 1 ampere of current under 1 volt potential difference.
Ohm's Law: Formula V = IR indicating the relationship between voltage (V), current (I), and resistance (R).
Ohmmeter: Tool for measuring circuit resistance in ohms.
Open Circuit: Circuit interruption (e.g., broken wire, open switch) halting current flow.
Parallel Circuit: Circuit with multiple paths for electricity; each load receives full circuit voltage, and total current is the sum of branch currents.
Piezoelectricity: Electric charge accumulation in certain crystals under mechanical stress.
Polarity: Term indicating positive and negative ends of electrical components such as batteries.
Power: Rate of energy transfer in an electric circuit, measured in watts (W).
Power Factor: Ratio of actual power used in AC circuits to apparent power, affected by reactance.
Protective Relay: Device that disconnects circuits upon fault detection.
Reactive Power: Power that maintains electric and magnetic fields in AC circuits, measured in VARs.
Rectifier: Device converting AC to DC, allowing current flow in one direction.
Relay: Switch that uses a small current to control larger currents.
Reluctance: Opposition a magnetic circuit presents to magnetic field lines.
Resistance: Opposition to electric current flow, compared to friction in fluid movement. Measured in ohms.
Resistor: Component made from wire or carbon providing resistance to current flow.
Rotor: Moving part of machines like generators and motors.
Self Induction: Voltage induced in a coil due to changes in current.
Semiconductor: Material with intermediate conductivity; silicon-based semiconductors are pivotal in electronics.
Series-Parallel Circuit: Circuit combining series and parallel connections among components.
Series Circuit: Circuit with a single path for current; all current flows through each load.
Service: Electrical conductors and equipment delivering energy from the supply system to users.
Short Circuit: Unintentional connection causing current diversion in a circuit.
Solid State Circuit: Integrated circuits using semiconductor devices for functionality.
Transistor: Three-terminal semiconductor device enabling amplification and rectification.
True Power: Measured in watts, indicating power in tangible forms; current and voltage in phase in pure resistance circuits.
VARS: Unit for reactive power, representing power flowing into reactive loads.
Variable Resistor: Adjustable resistor offering different resistance values.
Volt-Ampere (VA): Power measure, calculated as voltage times current (amps).
Volt (V): Unit of voltage; the potential difference causing 1 ampere current through 1 ohm resistance.
Voltage: Electromotive force driving electron flow, akin to water pressure in plumbing. Measured in volts.
Voltmeter: Instrument gauging voltage difference between two circuit points; characterized by high internal resistance.
Watt-hour (Wh): Energy equivalent of consuming 1 watt for 1 hour.
Watt (W): Unit of power representing 1 joule per second; corresponds to particular voltage and current in an electric circuit.
Wattmeter: Device measuring electric power in watts.
Waveform: Graph depicting electrical cycle variations in amplitude over time.

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Description

This quiz consists of flashcards covering fundamental concepts in Electrical Engineering, such as units of measure for inductance, frequency, and impedance. Test your knowledge of these essential terms and enhance your understanding of the subject.