The sun transfers energy to the earth by radiation at a rate of approximately 1 kw per square meter of surface. if this energy could be collected and converted to electrical energy with 25% efficiency, how large an area would be required to collect 5 kw? 1.25 m2 5 m2 20 m2 25 m2

Will you chech and finish these for me, because i am stumped with them.

What occurs during a combustion reaction

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?