Question

4. Um chuveiro elétrico instalado em uma rede de

Answer 1

Answer:

• 1.1 kilowatt-hour

Explanation:

The question is:

• 4. An electric shower installed in a network of 220 V, when in operation, is traversed by an electric current of intensity 20 A. Determine the electrical energy consumed, in kilowatt-hour, during a bath lasting 15 min.

1. Data:

a) V = 220V

b) I = 20 A

c) E = ?

2. Physical principles and formulae

Power, P, is equal to the product of the potential difference, V, by the current, I:

          $P=V\times I$

The energy, E, is equal to the product of the power, P, and the time, t:

         $E=P\times t$

3. Solution

         $P=220V\times 20A=4,400W=4,400J/s$

        $E=4,400W\times 15min\times 1hour/60min=1,100W-h=1.1kwatt-hour$