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# Science~Electricity

current the rate of electron flow past a given point in a circuit
the symbol for current is I
current is measured in amperes(A)
current is measured by an ammeter
ammeters must be connected in series
potential difference-voltage The amount of energy they lose is the potential difference or voltage drop, the electrical energy stored in a battery is potential difference or voltage rise
the symbol for potential difference/voltage is V
potential difference/voltage is measured in volts(V)
potential difference/voltage is measured by a voltmeter
voltmeters must be connected in parallel
resistance a property of a substance that hinders motion and converts electrical energy to other forms of energy
the more difficult it is for an electron to get through a circuit the greater the resistance
the symbol for resistance is R
resistance is measured in ohms
resistance is measured by an ohmmeter
1 of the four characteristics that affect the resistance of a wire-length the longer the wire the more resistance it offers
2 of the four characteristics that affect the resistance of a wire-area(width) the thinner the wire the more resistance it offers
3 of the four characteristics that affect the resistance of a wire-temperature the hotter the wire the more resistance it offers
4 of the four characteristics that affect the resistance of a wire-material the lower the conductivity the more resistance it offers
if the resistance stays the same and the current increases the voltage will increase
if the voltage stays the same and the resistance increases the current will decrease
if the current stays the same and the voltage increases the resistance will increase
Created by: syddj123

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