# Electronics definitions

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• Created by: leecy555
• Created on: 17-10-13 22:07
What is kirchoff's first law?
the sum of the currents into a junction is equal to the current out of a junction.
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What is Kirchoff's second law?
The sum of the EMF is equalto the sum of the potential differences in a closed loop.
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Ohm's law =
V=I(R+r) or V=IR
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What is EMF?
Electromotive force, energy converted from a form into electrical energy by a component per charge.
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What is PD?
Potential difference- Energy converted from electrical energy to another form by a component per unit charge.
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Define voltage
Voltage is the energy per unit charge: 1V=1J per C or work=voltsxcharge (w=VC)
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Define resistance
How much energy is lost per amp: 1ohm=1C per sec (ohm=Q/t or Q=It)
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Define resistivity
The resistance of 1m^3 of material (an ohmic meter) R=el/A or e=RA/l
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Define drift velocity
The average translational (sideways) speed of charges in a conductor: I=nAve- (current+number of electronsxcross sectional areaxvelocityxcharge of an electron)
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Define charge
A property of matter eg; an electron has a negative charge (e-) of 1.6x10^-19
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## Other cards in this set

### Card 2

#### Front

What is Kirchoff's second law?

#### Back

The sum of the EMF is equalto the sum of the potential differences in a closed loop.

Ohm's law =

What is EMF?

What is PD?