EMC Chapter 1 Flashcards
All matter consists of an organized collection of ___.
Atoms
A(n) ___ is a particle contained in the nucleus of an atom that has a positive electrical charge.
proton
The electrical term used to describe the opposition to electron flow is ___.
Resistance
The sources of energy used to produce electricity are coal and ___.
Nuclear power; natural gas; oil (D: All the above)
Ohm’s law states that voltage in a circuit is equal to ___.
Current times resistance
___ is the addition of impurities to the crystal structure of a semiconductor.
Doping
A(n) ___ is an electronic component that allows current to pass through it in only one direction.
diode
Common power sources that directly produce DC voltage are ___.
Batteries; fuel cells; photovoltaic cells (D: all the above)
___ current flow is current flow from negative too positive.
Electron
___ are used to avoid long expressions of units that are smaller or larger than the base unit.
Prefixes
___ and other electrical components can be connected in series.
Fuses; switches; loads (D: all the above)
The ___ in a circuit containing series-connected loads is the same throughout the circuit.
current
The total resistance in a circuit containing series-connected loads equals the ___ of the resistances of all loads.
sum
A(n) ___ connection has two or more components connected so there is more than one path for current flow.
parallel
The total resistance in a circuit containing parallel-connected loads is ___ the smallest resistance value.
less than
A(n)___connection is a combination of series- and parallel- connected components.
series/parallel
The total voltage applied across loads connected in series is ___ across the individual loads.
divided
Photovoltaic cells are rated by the amount of ___ they convert.
energy
In addition to the maximum voltage, each photovoltaic cell may produce up to ___ mA of current
40
The photovoltaic effect is measured using a high-impedance voltage-measuring device such as a ___.
digital multimeter
A magnet is a substance that produces a magnetic field and attracts ___.
Iron
A ___ magnet is a magnet that retains only trace amounts of magnetism after the magnetizing force has been removed
temporary
Permanent magnets may be demagnetized by a sharp blow are by ___.
heat
___ is the magnetism produced when electric current passes through a conductor.
Electromagnetism
The direction in which current flows through a conductor determines the ___ of the magnetic field around it.
direction
In an inductive circuit, the current lags the ___.
Voltage
___ is the ability of a component or circuit to store energy in the form of an electrical charge
Capacitance
The unit of capacitance is ___.
farads (F)
An inductive circuit is a circuit in which ___ lags voltage.
current
Inductance is normally stated in ___.
henrys (H)
___ power is the actual power used in an electrical circuit.
True
True power is measured in ___.
watts (W)
The relationship between power, voltage, and current may be visualized by presenting the power formula in ___ form.
pie chart
The power formula states that power (P) in a circuit is equal to voltage (E) ___ current (I)
times
The power formula states that voltage (E) in a circuit is equal to power (P) ___ current (I)
divided by
The power formula states current (I) in a circuit is equal to power (P) ___ voltage (E).
divided by
___ power is power absorbed and returned to a load due to its inductive and/or capacitive properties.
Reactive
___ power is a combination of true and reactive power.
Apparent
Ohm’s law is used in circuits that contain ___.
impedance
___ represents a load or circuit that includes both true power and reactive power.
Power factor
