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Study of the electrical installation of a house

The document on the following page represents part of the electrical installation of a house.

This installation consists of a circuit breaker, a radiator marked 4.4 kW, an iron marked 1100 W and a lamp marked 100 W.

On the phase line of each electrical device, a fuse is placed. The fuses are marked: 10 A, 32 A and 1 A.

The effective mains voltage is 220 V.

7.1- Are the electrical devices in this installation placed in series or in parallel? Justify the answer.

7.2- Give the meaning of the numbers 4.4 kW, 1100 W and 100 W marked respectively on each of the electrical appliances.

7.3- Calculate the effective intensity of the electric current which passes through each device when it is operating normally.

7.4- Deduce the intensity of the main current, specifying the law used to find the answer.

7.5- Are the fuses suitable for the devices they protect? Justify the answer.

7.6- If the main circuit breaker is marked 30 A, can all these devices be operated at the same time? Justify the answer.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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-the future of geothermal energy can pretty much be summed up with a single word: more

-scientists plan in going deeper than 120 meters

-we are hoping that one day, we will get all of our energy from renewable energy sources such as geothermal energy

hope this !

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods