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Electric Current
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Gravity
Terms in this set (37)
Electric pressure that can produce a flow of charge in a conductor
Voltage
This causes a charge to flow between the ends of a conductor
Potential Difference
The flow of charge will continue until this happens on both ends
Common Potential
What causes there to no longer be a flow of charge through the conductor
No Potential Difference
The net charge in a current-carrying wire
Zero
What are two types of voltage sources
Batteries and Generators
The flow of electric charge is
Electric Current
Particles within a solid conductor that carry charge through a circuit
Electrons called Conduction Electrons
Electric current is measured in
Amperes (amps)
An ampere is equal to
the flow of 1 coulomb of charge per second
Something that provides this is known as a "voltage source"
Potential Difference
The potential energy per coulomb of charge available to electrons moving between terminals is the
Voltage (electromotive force, or emf)
Charges flow through a
Circuit
Charges flow through a circuit because of an
applied voltage across the circuit.
Voltage causes
current
The resistance of a wire depends on the
conductivity of the material used
The resistance of a wire also depends on the
thickness and length of the wire
The amount of charge that flows in a circuit depends on the voltage provided by the
voltage source
The current also depends on the resistance that the conductor offers to the
flow of charge - the electric resistance
The resistance of some materials becomes zero at very low temeratures known as
Superconductivity
Electric resistance is measured in units called
ohms
The current in a circuit is directly proportional to the voltage impressed across the circuit, and is inversely proportional to the resistance of the circuit which is stated as
Ohm's Law
voltage/resistance equals
current
The relationship among the units of measurement for current, voltage and resistance is
1 amp = 1 volt/ohm
This is how you express Ohm's Law mathematically
1 ampere = 1 volt/ohm
These limit the amount of electricity that can flow
Resisters
The damaging effects of electric shock are the result of this possing through the body
current
From Ohm's law, we can see that a damaging electric current depends on these two things:
the voltage applied and the electrical resistance of the human body
The resistance of the human body is about this many if soaked with salt water
100 ohms
The resistance of the human body can range up to this if the skin is very dry
500,000 ohms
It is dangerous to handle electric devices while taking a bath because
water can conduct current to the user
In order for a bird to receive a shock while sitting on a wire, this must occur between one part of its body and another part
a difference in potential
The purpose of the third prong on a three-prong electric plug is
to ground the electric plug
Electric power is defined as
the rate at which electrical energy is converted into another form such as mechanical energy, heat, or light.
Electric power is stated in equation form as
electric power = current x voltage
Electric power is expressed in terms of units as
1 watt = (1ampere) x (1 volt)
On kilowatt-hour is the amount of energy consumed in
1 hour at the rate of 1 kilowatt, or 1000 watts
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