Question

A power supply rated at 430 watts will consume 430 watts of electricity every hour such that in 10 hours it will consume 4.3 kilowatts of power. True or False.

Answer 1

True

Step-by-step explanation:

This can be solved as a rule of three problem

Rule of three problem:

In a rule of three problem, the first step is identifying the measures and how they are related, if their relationship is direct of inverse.

When the relationship between the measures is direct, as the value of one measure increases, the value of the other measure is going to increase too. In this case, the rule of three is a cross multiplication.

When the relationship between the measures is inverse, as the value of one measure increases, the value of the other measure will decrease. In this case, the rule of three is a line multiplication.

For the first rule of three, our measures are:

-The power consumption

-The number of hours

As the number of hours increases, so will the power consumption, which means we have this direct rule of three:

1h - 430W

10h - xW

x = 4300W

Each kilowatt has 1000W. As the number of W increases, so will the number of kW. Another direct rule of three. So

1kW - 1000W

xkW - 4300W

1000x = 4300

`x = (4300)/(1000)`

x = 4.3kW

In 10 hours, 4.3 kilowatts of power are consumed.True