electricity Flashcards
what is the formula for power
power = energy transferred (J) / time taken (s)
what is energy measured in
juoles or kilojuoles
what is power measured in
watts or kilowatts
what is the formula for energy
energy = power (w) x time taken (s)
what is the formula for time taken
time taken = energy transferred (J) / power (w)
how do lighthouses get their light
an electric current transfers energy from the main supply to the lamp in the light house. the lamp changes this energy into light and thermal energy.
define power
the rate at which energy is converted
define filament
is very thin and glows when it’s heated
what does LED stand for
light-emitting diode
what does CFL stand for
compact fluorescent lamp
which is more efficient: LED or CFL
LED
what is a capacitor
2 metal plats separated by a dielectric
what is a dielectric
an insulator between the 2 metal plates in a capacitor
what does CCD stand for
charged coupled device
what is a digital signal
the charge of each component of a CCD is transferred to a circuit that produces a type of signal, that signal is a digital signal.
