Vital things to remember
Charge is the number of electrons on or in a body and is
measured in Coulombs
1 Coulomb = 6.25 x 1018 electrons or
1 electron charge = 1.6x10-19 Coulombs |
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you don't necessarily need to remember the numbers |
Current is the flow of charge and is measured in Amps
1 Amp = 1 Coulomb per second
Potential is the force between 2 points that can cause current
to flow and is measured in Volts
1 Volt = the potential between 2 points for which a current of
1 Amp will dissipate 1 Joule per second
Power is the energy dissipated per second and is measured
in Watts
1 Watt = 1 Volt x 1 Amp
Resistance is the property of a material that resists the
flow of current and is measured in Ohms (
W)
1 W
= the resistance that allows 1 Amp to flow when 1 Volt is applied
Kirchoff's Voltage Law:
The sum of the voltages around a circuit loop is zero
Kirchoff's Current Law:
The sum of the currents flowing into any point or node of a circuit
is zero. |