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Dahasolnce [82]
3 years ago
15

Work out the current through an electric kettle with a power of 2.2 kW if it uses the 180 V mains supply. Round your answer to 2

significant figures.
Physics
1 answer:
weeeeeb [17]3 years ago
7 0

Answer:

12 A

Explanation:

Given,

Power of electric kettle=2.2 kW=2200W (since 1kW=1000W)

Voltage=180V

Current=?

Power = Voltage*Current

Current = Power ÷ Voltage

=2200W ÷ 180V

=12.22 Ampere

=12 A

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RUDIKE [14]

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According to Oxford Dictionaries "Precision" means "the quality, condition, or fact of being exact and accurate."

Explanation:

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6 0
2 years ago
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Warm air aloft is normally higher pressure relative to colder air aloft, which is normally of lower pressure (at equivalent alti
Allisa [31]

Answer:

the statement given is False.

Explanation:

The pressure is defined by

     P = F / A

The force of the air is its weight,

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The weight of an air column on us depends on the energy of the molecules that is related to the temperature

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 When the air is warmer it has more energy so the molecules can move more distance and therefore the average density of the gas decreases, as the density decreases, the weight of the column on us also decreases, therefore the pressure low.

The correct statement is: When the air is hotter it has less pressure than when the air is cold.

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6 0
4 years ago
What are three things that travel in waves
BaLLatris [955]
Radio, light, and sound

8 0
3 years ago
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A ball rolls down a hill and hits a box. The momentum of the ball decreases. Which happens to the momentum? Select one of the op
Irina-Kira [14]
<span>So we want to know what happens to the momentum of the ball that rolls down hill and hits a box. So we need to use the law of conservation of momentum which states that the momentum must be conserved. It cant be transformed into inertia or mass. It can only be transferred to other object via some interactions like collisions. So it has to be a. transferred to the box and that is the correct answer. </span>
7 0
3 years ago
Resting energy expenditure is a. slightly higher than basal energy expenditure. b. the same as basal energy expenditure. c. slig
kvv77 [185]

Answer:

B. Resting energy expenditure is the same with basal energy expenditure.

Explanation:

Basal Energy Expenditure can be explained as the energy required to execute essential metabolic functions e.g. coordination of enzymatic reactions in the body system.

On the other hand, Resting Energy Expenditure can be simply explained as the amount of energy expended or burnt when the body is resting.

Hence, in the context of definitions, and relating both definitions, it can be argued that Basal energy expenditure is simply the energy needed to execute essential metabolic functions e.g. coordination of enzymatic reactions in the body, with special emphassy on the body being at rest. Thus, in this context, Basal energy can be looked at through the prism of Resting energy expenditure. Consequently, this two definitions can be used interchangeably, with a special emphassy on perspective.

6 0
4 years ago
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