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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.

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