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Oduvanchick [21]
3 years ago
5

A circuit has a voltage drop of 12.0 V across a 30.0 resistor that carries a current of 0.400 A. What is the power used by the r

esistor? Use P = VI.
A. 360.0 W
B. 12.0 W
C. 4.80 W
D. 57.0 W
Physics
2 answers:
Aloiza [94]3 years ago
7 0

Option ( c ) is correct.

Using the formula for power

P= i^2 R

P= power

i= current= 0.4 A

R= resistance= 30 ohm

so power= (0.4)² (30)

Power=4.8 W

Tcecarenko [31]3 years ago
6 0
P=VI
P=12.0×0.400
P=4.80 Watt
So C is right
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The temperature of the plasma will increase as current is passed through it.

<h3>Meaning of Current and temperature</h3>

Current can be defined as a flow of charged particles through a medium and the particles includes: electrons or ions.

Temperature is the degree of hotness or coldness experienced by a material.

The more current passes through the plasma the more energy is induced making the particles to move faster which in turns causes temperature to increase and reducing the resistance of the plasma.

In conclusion, The current causes temperature to increase and this reduces the resistance.

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2 years ago
Which of the following is always true about a synthesis reaction?
USPshnik [31]
A synthesis reaction forms one product from two reactants. 
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7 0
3 years ago
……………………………………………………………..?
kotegsom [21]

Answer:

C

Explanation:

First find the electrical wattage

W = I^2 * R

R = 12 ohms

I = 2 amps

Wattage = 2^2 * 12

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Wattage = 48 watts.

Now you need to use the power formula

Work = Power * Time

Work = ?

Power = 48 watts

Time = 3 minutes = 3 * 60 = 180 seconds.

Work = 48 * 180

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That's C

3 0
3 years ago
A square is cut out of a copper sheet. Two straight scratches on the surface of the square intersect forming an angle theta. The
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Answer:

<em>a) increases</em>

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Almost all substance or material undergoes expansion due to heating. Heat gives thermal energy to the molecules of a substance increasing their body temperature. The temperature of a substance is the measure of the average kinetic energy of the molecules of that substance. When the temperature of a substance increases, the molecules begin to agitate and try to move far from each other, leading to either a linear, area, or cubic expansion, or all three of them. Metals like copper expand very well on heating, and their expansion is relatively minute, but very observable. When the face of such a copper is scratched to give and angle, heating the copper uniformly will cause the copper to expand, leading to an increase in the angle formed.

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4 years ago
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mrs_skeptik [129]

Answer:

5070

Explanation:

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5 0
3 years ago
Read 2 more answers
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