Physics, 24.12.2019 23:31 geekymuin

How do i find the potential difference across and what formula should i use to find the power?

Answers: 2

Show answers

Answers

This is a series circuit.
If you are an electron coming out of one terminal of the generator,
you have to flow through

==> one side of the cable,
==> the lights,
==> the other side of the cable

in order to get back to the other terminal of the generator.

Each side of the cable is a resistor, with resistance of 1 ohm.
The voltage across a resistor is (current) x (resistance).
So the voltage between the ends of one side of the cable is

(10 A) x (1 ohm) = 10 volts .

The current LOSES ENERGY from pushing through the resistors (cable).
It loses 10 volts pushing through each side of the cable.
So, out at the end where the floodlights are, there's only
(240 - 10 - 10) = 220 volts across the lights.

Every electron that leaves the generator has to flow around the
whole loop and return to the generator. New electrons can't be
born anywhere, and they can't disappear.

So the current is the same at every point in a series circuit.
In this circuit, it's 10 A.

Electrical power is (voltage) x (current) .

In the floodlights, that's (220 V) x (10 A) = 2,200 watts.

Notice that there's a voltage across each side of the cable too ... 10 volts.
So there's power there too.

On each side of the cable, power = (10 V) x (10 A) = 100 watts !

100 watts of power gets lost pushing the electrons through the cable.
On both sides of the cable, that's 200 watts of lost power.
Where does it go ? ?

The cable gets warm, and it heats up the air around it.

THIS is why it's dangerous to plug too many things all into the
same extension cord in your house. The extension cord has
some resistance, so some power is used to push the current
through it. If you plug too many things into it, the current will
get too big. The cord will get hot, and that could burn the dog
or even start a fire.

Answer from: Quest

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

Answer from: Quest

Ihope you find the answer

Other questions on the subject: Physics

Physics, 22.06.2019 00:00, madskate9993

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

Answers: 1

continue

Physics, 22.06.2019 01:00, Mimix2k

15. give an example for some particles or waves that are moving faster than light in everyday life 16. what is a laser? 17. what is an oscilloscope? 18. what does it means practically that nothing is faster than light in vacuum? 19. what is vacuum?

Answers: 2

continue

Physics, 22.06.2019 09:30, xxtonixwilsonxx

True or false graphs must include scales that increase by the same amount

Answers: 1

continue

Physics, 22.06.2019 12:30, lanaasad7733

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg. how much energy e must be supplied to the device? express your answer in joules.