Energy Transfer Flashcards
resistors get … when an … passes through them
hot
electric current
what is electrical power
the rate at which an appliance transfers energy
an appliance with a high power rating transfers what
a lot of energy in a short time (comes from the current running through it)
what will an appliance with a high power rating do
draw a large current from the supply
what is power measured in
watts (W)
what is the formula for electrical power
electrical power = current x voltage (p = IV)
what should fuses be rated in
as near as possible but just higher than the normal operating current
how to work out the fuse needed
work out the current that the appliance will normally use
when a current goes through a light bulb what energy is transferred
electrical –> light
energy transfer equation
energy transferred = current x voltage x time
E = ItV
what are the forms of stored energy
gravitational potential and chemical and elastic
what is energy conservation
about using fewer resources because of the damage they do and because they might run out
energy is only useful when
it can be transferred from one form into another
most energy transfers involve some losses often being..
heat
the less energy that is wasted in an energy transfer the more..
efficient the appliance is said to be
