electricity - charge and energy transfer Flashcards
how is electrical charge measured
in coulombs - C
a current of 1 amore = ?
1 coulomb of charge flowing per second
the size of electrical current = ?
the rate of flow of electrical charge
charge flow equation
charge flow = current x time
what is the energy transfer equation
energy transferred = charge flow x potential difference
for a blender and a fan what is it powered by, and what does this transfer to
powered by electrical energy and that gets transferred into kinetic energy of electric motors
why would there also be a small amount of thermal energy produced
due to friction
for an iron and a kettle what is it powered by, and what does this transfer to
powered by electrical energy which turns into thermal energy to generate heat
give two examples of appliances that transfer electrical energy into both kinetic and thermal energy
hair dryer and washing machine
what is power
the rate at which energy is transferred
1 watt is an energy transfer of ?
1 joule per second
if a blender has a power rating of 400W what doe this mean
it transfers 400 joules of electrical energy per second
what is the power rating like for an appliance designed to generate thermal energy
much higher then one designed for kinetic energy
how to calculate the energy
power x time
what is a key point about this equation
the time has to be ins seconds
