How much heat energy is produced by 0.5 wh of electrical energy? a. 2.6 btu b. 0.15 btu c. 1.7 btu d. 0.4 btu

Answer;

1.7 Btu

Explanation and solution;

-Energy is a measure of how much fuel is contained within something, or used by something over a specific period of time.

-The kilowatt hour (kWh) is a unit of energy. The Calorie is a unit of energy. And the joule (J) is a unit of energy. BTU, the watt hour (Wh), and therm are also other units of energy.

Solution;

1 Watt = 3.41214 Btu/h,

1watt*hr = 3.41214 Btu,

0.5 Wh =3.41214/2Btu,

Therefore; 0.5 Wh =1.7 Btu.

c. magnitude and direction

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.