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masha68 [24]
3 years ago
6

If the current is cut in half and the resistance is increased by a factor of three, how will the power be affected?

Physics
1 answer:
olasank [31]3 years ago
8 0

One formula for the power dissipated in an electric circuit is

         Power  =  (current)² x (resistance) .

I think that's the one we should use, because it has exactly
all of the quantities that we know or need to find.

OK.       
               Original power  =  (original current)² x (original resistance)
and
               New power  =  (new current)²  x  (new resistance)

                                 =  (0.5 x old current)² x (3 x old resistance)

                                 = (0.25) (old current)² x (3) (old resistance)

                                 =  (0.75) (original current)² (original resistance)

                                 =  (0.75) (original power) .

Summary:        New power  =  (0.75) (original power)

That looks just like
choice B: 
                 The power will decrease to 75 percent of its previous value.
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Answer:

4. The choose b. 0.000355

Ans; 3.55× 10-⁴ = 0.000355

5. The choose C. 80600

Ans; 8.06 ×10⁴= 806×10² = 80600

I hope I helped you^_^

4 0
2 years ago
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Explain two ways that static and current electricity are different?
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3 years ago
Cell phones do not work everywhere. There are places where your cell phone cannot get a signal
shusha [124]
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A 25 kg child stands 2.5 m from the center of a frictionless merry‐go‐round, which has a 200 kg*m^2 moment of inertia and is spi
vodka [1.7K]

Answer:

Explanation:

a ) Time period  T = 2 s

Angular velocity ω = 2π / T

=  2π / 2 = 3.14 rad /s

Initial moment of inertia I₁ = 200 + mr²

= 200 + 25 x 2.5²

=356.25

Final moment of inertia

I₂ = 200 + 25 X 1.5 X 1.5

= 256.25

b ) We apply law of conservation of momentum

I₁ X ω₁ =  I₂ X ω₂

ω₂ = I₁ X ω₁ / I₂

Putting the values

w_2=\frac{356.25\times3.14}{256.25}

ω₂ = 4.365 rad s⁻¹

c ) Increase in rotational kinetic energy

=1/2 I₂ X ω₂² -  1/2 I₁ X ω₁²

.5 X 256.25 X 4.365² - .5 X 356.25 X 3.14²

= 684.95 J

This energy comes from work done against the centripetal pseudo -force.

7 0
3 years ago
An electric wheel chair is designed to run on a single 12-V battery rated to provide 100 ampere-hours. How much energy is stored
Paha777 [63]

Explanation:

It is given that,

Voltage of the battery, V = 12 V

Current, I = 100 ampere-hours

Energy stored is given by the product of power and time taken. So,

E=P\times t

P is the power, P=V\times I

P=12\times 100

P = 1200 watts

This power can be used for 1 hour or 3600 seconds

Energy, E=1200\times 3600

E = 4320000 J

So, the energy stored in this battery is 4320000 J. Hence, this is the required solution.

5 0
3 years ago
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