The current flowing through a lamp is 1.5 a. it is plugged into a 120-v outlet. what is the resistance of the lamp

Explanation:

According to ohm's law, current flowing through a conductor is directly proportional to the voltage over resistance.

Mathematically,       I =

where,     I = current

               V = voltage

                R = resistance

It is given that value of voltage is 120 V and current is 1.5 ampere. Therefore, calculate the resistance as follows.

                            I =

or,                         R =

                                =

                                = 80 volts per ampere

                               = 80 ohms

Hence, resistance of the lamp is 80 ohms.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

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.