current definition
a flow of electrical charge
potential difference definition
the driving force that pushes charge
resistance defintition
anything that slows the flow of charge down.
potential difference is measured in
Volts (V)
resistance is measured in
Ohms
current is measured in
Amperes (A)
the greater the resistance …
the smaller the current that flows ( for a given potential difference)
Q=It
charge flow (C) = Current (A) x Time (s)
V=IR
potential difference = current x resistance
(V) = (A). x (ohms)
mains supply =
AC
battery supply =
DC
the power of an appliance is
the energy that it transfers per second
earth wire
green and yellow
live wire
brown