Acurrent of 9 a flows through an electric device with a resistance of 43 ω. what must be the applied voltage in this particular circuit?

a. 387 v
b. 4.8 v
c. 387 a
d. 4.8 a

( the answer choice ; "a." 387 v , was marked incorrect. )

Option (A) is the correct answer.

Explanation:

Ohm's law states that current passing through a circuit is directly proportional to the voltage over resistance.

Mathematically,      

where,      I = current

                V = voltage

                 R = resistance

It is given that electric device has current of 9 A and resistance of 43 ohms. Therefore, calculate the voltage as follows.

or,                  

                                 =

                                 = 387 V

Thus, we can conclude that the applied voltage in this particular circuit is 387 V.

measuring things 1 litre of water

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.