Question

In the livingroom of your house you would like to run a 300 W stereo, a 30 W computer, a 960 W laser light projector, and two 120 W lights. Assuming your house is wired for 120 Volts, how much current will be pulled by these electrical devices

Answer 1

Answer:

12.75 A

Explanation:

The total power is 300 + 30 + 960 + 2 × 120 = 1530 W

Electrical power is given by

$P = IV$

Then

$I = \dfrac{P}{V}$

With a voltage of 120 V,

$I = \dfrac{1530}{120} = 12.75 \text{ A}$

Answer 2

Answer:

12.75 A

Explanation:

Current: This can be defined as the rate of flow of charge in a circuit. The S.I unit of current is Ampere (A).

From the question above,

I = P/V................... Equation 1

Where I = current, P = Total power, V = Voltage.

P = 300+30+960+(2×120)

P = 1530 W.

Given: V = 120 V, P = 1530 W.

Substitute into equation 1

I = 1530/120

I = 12.75 A.

Thus the amount of current pulled by the electric devices = 12.75 A