An electric heater is operated by applying a potential difference of 78.0 v across a nichrome wire of total resistance 7.00 ω. a) find the current in the wire. answer in units of a.
b) find the power rating of the heater. answer in units of w.

PART A)

Here we know that

potential difference across the wire is

resistance of wire is

now by ohm's law

Part b)

Power rating is defined as rate of electrical energy

it is defined as

now we have

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

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