energy would it take to boil the kettle?
A standard kitchen
kettle takes about 2000 Watts of electrical power. The energy available
from the sun depends on how much air the light has to pass through.
Obviously the sun is hotter on the equator than at other latitudes,
whatever the time of year. At the equator when the
sun is straight overhead the power available from the sun is about
1000 Watts per square meter (1kW/m2). So if you have
a parabolic mirror that has an area of two square meters and you use
it to focus the energy on to the bottom of a kettle you will achieve
the same sort of power as you would from the electricity socket
with an electric kettle.
Our mirror only
had an area of one square meter but unlike the kitchen kettle whose job is to boil
water we don't need to actually get the water boiling to produce
a vapor that we can condense to form steam.