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Science~Electricity
Question | Answer |
---|---|
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 |