31 terms

Abeka Physics Chapter 26

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joule heat
term for the heat generated by current when it passes through a resistance
power
term for the time rate of work
house current
term for the current furnished by electric power companies
rate, resistance
The effective value of an alternating current is regarded as equal to the direct current that would produce heat at the same average ___ in the same _____.
root-mean-square (rms) value
term for the effective value of an alternating current
capacitance
term for the maximum charge that a plate can hold
capacitor
term for a charge-storing device consisting of two conductors in near relation but not touching
farad
the unit of capacitance
microfarads, picofarads
Because they typically store only very small amounts of charge, capacitors usually have capacitances measured in _____ or _____.
area, closer together, dielectric
Capacitance may be changed by:
1.) Increasing the ___ of each plate.
2.) Bringing the plates ____ _____.
3.) Filling the gap between the plates with _____.
dielectric
term that describes a material that reduces the voltage associated with a given state of charge
dielectric constant
term for the factor by which capacitance is multiplied when a certain material is used as a dielectric
dielectric strength
term for the maximum potential gradient that a material can withstand before it begins to conduct current
self-induced emf
If a change in magnetic flux arises from a fluctuation of current within the conducting loop itself, ______ ___ is produced.
opposes
An induced emf ____ the change inducing it.
self-inductance
term for the tendency of a loop or a coil to oppose any change in current
inductor
term for a circuit element with the property of self-inductance
henry
the unit of inductance
primary, secondary
If two coils in separate circuits are brought close together, changing current in the first (____) coil induces a current in the second (______) coil.
mutual inductance
term for the induction of an emf in one coil by another coil
inductance
term for the combined effect of both mutual inductance and self-inductance
henrys
Mutual inductance is measured in ____.
packing density
term for the number of turns per unit length of a coil
series-aiding combination
term for an arrangement in which the self-inductance in each coil is enhanced by mutual inductance because all the magnetic flux in both coils runs in the same direction
series-opposing combination
term for an arrangement in which self-inductance and mutual inductance have contrary effects
transformer
term for a device for producing a fixed increase or decrease in voltage
transformer equation
term for the equation that relates the voltages and numbers of turns in the primary and secondary coils of a transformer
step-up transformer
term for a transformer that increases voltage
step-down transformer
term for a transformer that decreases voltage
ninety-five
A well-designed transformer transmits energy from the primary circuit to the secondary circuit with above _____ percent efficiency.
Joseph Henry
the physicist who experimented with electricity and magnetism and discovered electromagnetic induction independently of Faraday
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