measurement in electric circuits Flashcards
what is the symbol for electric charge?
Q
what is the unit for electric charge?
coulomb (C)
what is 1C equal to?
the charge of 6.25 x 10 to the power of 18 electrons
what is electric current?
the rate of the movement of electric charge in an electric circuit
what is the symbol for electric current?
I
what is the unit for electric current?
ampere (A)
what are the two ways electrons can flow in an electric circuit?
-conventional flow -electron flow
what is conventional flow?
the electrons flow from the positive terminal to the negative terminal
what is electron flow?
the electrons flow from the negative terminal to the positive terminal
which flow is correct, but not widely used?
electron flow (negative => positive)
which flow is incorrect but widely accepted?
conventional flow (positive => negative)
what is electric current measured with?
an ammeter
how does an ammeter work?
it is connected in series to the item you want to measure, which means you put the ammeter in front or behind the item you want to measure
what is the symbol for an ammeter?
how fast do electrons move?
less than 0.01 cm/s
why does electric equipment turn on immediately?
the whole circuit is full of electrons and any push by an electron from the power source will push every electron in the path
what is potential difference/ voltage?
the difference in electrical potential energy when a charge moved between two points in an electric circuit
what is the symbol for voltage?
V
what is the unit for voltage?
volts (V)
what is 1V equal to?
1J of energy per 1C or charge (each coulomb of charge have 1J unit of energy)
what is voltage measured with?
a voltmeter
how does a voltmeter work?
it is connected in parallel to the item you want to measure, which means you create a new path for the voltmeter next to the item you want to measure
what is the symbol for a voltmeter?
what is electric resistance?
the opposition to the flow of electric current in a material. this is a property of the material
