3 years ago

Hydroelectric power uses: wind water coal the sun

Physics

1 answer:

Ivanshal [37]3 years ago

3 0

hydroelectric uses water

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The power rating of a light bulb (such as a 100-W bulb) is the power it dissipates when connected across a 120-V potential diffe

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To solve this problem we will apply the concepts related to the calculation of power, from the two electrical forms:

$P = VI$

$P = \frac{V^2}{R}$

Here,

V = Voltage

I = Current

R= Resistance

P = Power

PART A)

$R = \frac{V^2}{P}$

Replacing,

$R = \frac{(120V)^2}{150W}$

$R = 96\Omega$

Resistance of bulb is $96\Omega$

PART B)

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

$I = \frac{150W}{120V}$

$I = 1.25A$

The bulb will draw 1.25A current

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V and R are ___________ proportional.

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B- V and R are directly proportional to eachother

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A wire with a current of 5.2 A is at an angle of 45° relative to a magnetic field of 0.87 T. What is the force exerted on a 1.2

julsineya [31]

Answer:

F = I L X B = I L B sin theta

F = 5.2 * 1.2 * .87 sin 45 = 3.84 N in the direction of (L X B)

Note: L and B must be at right angles for F = I L B

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Which of the following will be attracted to the north pole of a magnet?

tangare [24]

The answer is A. The South Pole of another magnet. I hope this helps

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Consider a collection of charges in a given region and suppose all other charges are distant and have a negligible effect. Furth

AlladinOne [14]

Answer:

E. Some charges in the region are positive, and some are negative.

Explanation:

Electric potential is given as;

$V = \frac{W}{Q}$

where;

W is the work done in moving a charge between two points which have a difference in potential

Q is quantity of charge in the given region

If the electric potential at a given point in the region is zero, then sum of the charges in the given region must be equal to zero. For the charges to sum to zero, some will be positive while some will be negative,.

Therefore, the correct statement in the given options is "E"

E. Some charges in the region are positive, and some are negative.

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