Fuses and circuit breakers are connected in with the load and all other components in the circuit.

series

Explanation:

the fuse and circuit breakers  are protective devices meant to protect all loads and components in a circuit, therefore current has to pass trough them before getting to the loads and components and hence they are connected in series. If current that comes trough the fuse is above its required rating, the fuse will cut and if its the breaker it will trip off, hence preventing flow of current and damage to other loads and circuitry.    

a 2,000 calorie based diet.

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.