How many volts would it take to push 1 amp through a resistance of 1 ohm?
2 answers:
Answer:
.
Explanation:
Ohm's Law give the following relationship between the potential across a conductor, the electrical resistance
of that conductor, and the current
through that conductor:
.
It is given that the current through this conductor is , and that the electrical resistance of this conductor is
.
Note, that the unit of electrical resistance Ohm is a composite unit; (volts per ampere.)
Substitute the value of and
into the equation
from Ohm's Law to find the potential across this conductor:
.
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Complete Question
A satellite in geostationary orbit is used to transmit data via electromagnetic radiation. The satellite is at a height of 35,000 km above the surface of the earth, and we assume it has an isotropic power output of 1 kW (although, in practice, satellite antennas transmit signals that are less powerful but more directional).
Reception devices pick up the variation in the electric field vector of the electromagnetic wave sent out by the satellite. Given the satellite specifications listed in the problem introduction, what is the amplitude E0 of the electric field vector of the satellite broadcast as measured at the surface of the earth? Use ϵ0=8.85×10^−12C/(V⋅m) for the permittivity of space and c=3.00×10^8m/s for the speed of light.
Answer:
The electric field vector of the satellite broadcast as measured at the surface of the earth is
Explanation:
From the question we are told that
The height of the satellite is
The power output of the satellite is
Generally the intensity of the electromagnetic radiation of the satellite at the surface of the earth is mathematically represented as
substituting values
This intensity of the electromagnetic radiation of the satellite at the surface of the earth can also be mathematically represented as
Where is the amplitude of the electric field vector of the satellite broadcast so
substituting values