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Physical Science Ch 17
Section A & B
26
Science
9th Grade
02/09/2012

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Term
static electricity
Definition
the effects produced by stationary charges
Term
law of charges
Definition
like charges repel; unlike charges attract
Term
capacitors
Definition
an object or device that stores an electric charge
Term
induction
Definition
charging an object by shifting the paths of its electrons
Term
electroscope
Definition
a device that detects charges
Term
semiconductors
Definition
a substance that holds its electrons in a way that allows a partial flow of electricity
Term
electric current
Definition
continuously moving electrical charges
Term
circuit
Definition
a circular conducting path
Term
switch
Definition
a device that can be used to break (open or close) a circuit
Term
short circuit
Definition
a situation in which an electrical current passes through a path shorter than the entire circuit
Term
volts (V)
Definition
the unit measurement of the difference between electrical potentials
Term
coulomb (C) (pronounced KOOlom)
Definition

the unit of electrical charge;

 the charge carried by 6.25 x 1018 electrons

Term
amperes (A)
Definition
the unit used to measure the amount of current that flows past a point in one second
Term
resistor
Definition
any object that resists the flow of electricity
Term
Ohm's law
Definition
voltage equals the current multiplied by the resistance
Term
Ohms (Ω)
Definition
the unit used to measure resistance
Term
loads
Definition
the resistive devices in an electrical circuit
Term
series circuit
Definition
a circuit with a single path for all the electrons in it to follow
Term
parallel circuit
Definition
a circuit with two or more paths for the electrons in it to follow
Term
fuses
Definition
a safety device that melts to break a circuit if current becomes too high
Term
circuit breaker
Definition
a safety device that switches to break a circuit if current becomes too high
Term
watt (W)
Definition
The S unit of power; 1 joule of energy per second
Term
kilowatt (kW)
Definition
1000 watts
Term
Units of Electricity Measurement
Definition

1 joule - 1 newton meter

1 watt = 1 joule/second

1 coulomb = 6.25 x 10 18 electrons

1 ampere = 1  coulomb/second

1 volt = 1 joule/coulomb

1 ohm = 1 volt/amp

Term
Ohm's law
Definition

V = IR

Voltage = current  x  resistance

Term
Power
Definition

P = IV

Power = current  x  voltage

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