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3 years ago

What is the unit for resistance, voltage and current (all three separately)

1 answer:

3 0

The unit of resistance is the ohm. Resistance is a measure of the energy
that a component robs from current passing through it, and dissipates.
A resistance of 1 ohm means that in order to force 1 Coulomb of charge
(6.25 x 10¹⁸ electrons) through that obstacle, you need to give it 1 joule
of energy. The electrons will lose that much energy on their way through
the 1-ohm "resistor", and the joule will make the resistor warmer.

The unit of electrical potential difference between two points is the volt.
1 volt of potential difference means that in order to lift 1 Coulomb of
charge (6.25 x 10¹⁸ electrons) to a place where the potential is 1 volt
higher, you need to give it 1 joule of energy. And when the Coulomb
falls down through a circuit to a place where the potential is lower, it
gives up 1 joule of energy for every volt it falls through.

The unit of electric current is the Ampere. A current of 1 Ampere means
that 6.25 x10¹⁸ electrons (1 Coulomb of charge) are flowing past a point
in the wire every second.

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When Missourians carve their initials into the bark of a tree, the damage leaves the tree open to ____________________.

sasho [114]

Answer:

In fact, carving letters into a tree probably won't hurt it. ... In general, the tree will compartmentalize the wound and it will heal over. The initials that remain visible are essentially scar tissue, permanent scar tissue.

Explanation:

Unfortunately, when carving into the trunk of a tree the blade of a knife often penetrates the outer bark and cuts into the inner bark. ... In cases that the phloem is damaged all the way around the trunk (in a ring for example), the tree will slowly and eventually starve to death.

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luke_raines19

5 0

3 years ago

An ideal spring hangs from the ceiling. A 1.95 kg mass is hung from the spring, stretching the spring a distance d=0.0865 m from

uranmaximum [27]

Answer:

kinetic energy = 0.1168 J

Explanation:

From Hooke's law, we know that ;

F = kx

k = F/x

We are given ;

Mass; m = 1.95 kg

Spring stretch; d = x = 0.0865

So, Force = mg = 1.95 × 9.81

k = 1.95 × 9.81/0.0865 = 221.15 N/m

Now, initial energy is;

E1 = mgL + ½k(x - L)²

Also, final energy; E2 = ½kx² + ½mv²

From conservation of energy, E1 = E2

Thus;

mgL + ½k(x - L)² = ½kx² + ½mv²

Making the kinetic energy ½mv² the subject, we have;

½mv² = mgL + ½k(x - L)² - ½kx²

We are given L=0.0325 m

Plugging other relevant values, we have ;

½mv² = (1.95 × 9.81 × 0.0325) + (½ × 221.15(0.0865 - 0.0325)² - ½(221.15 × 0.0865²)

½mv² = 0.62170875 + 0.3224367 - 0.82734979375

½mv² = 0.1168 J

7 0

3 years ago

What is the strength of the electric field between two parallel conducting plates separated by 1.00 cm and having a potential di

raketka [301]

Answer:

$E=3.22*10^6 N/C$

Explanation:

From the question we are told that:

Separation Distance $d=1.0cm =0.01m$

Potential difference $V=3.22 * 10^4 V$

Generally the equation for Electric Field strength is mathematically given by

$E=\frac{v}{d}$

$E=\frac{3.22*10^4}{0.01}$

$E=3.22*10^6 N/C$

8 0

3 years ago

A person exerts a 19-N force on a cart attached to a spring and holds the cart steady. The cart is displaced 0.060 m from its eq

Mariana [72]

To solve this problem, apply the concepts related to Hooke's law. From there we will find the spring constant. Subsequently, applying Energy balance, which includes gravitational potential energy, elastic potential energy and kinetic energy, we will bury the system's energy. Finally, using the displacement expression for the simple harmonic movement, we will find the expression that describes the system.

PART A) The expression for the spring force is

$F=kx$

Here,

k = Spring constant

x = Displacement

Rearranging to find the spring constant we have that

$k = \frac{F}{x}$

$k = \frac{19}{0.06}$

$k = 316.66N/m \approx 320N/m$

PART B ) The gravitational potential energy acts on the spring holds the cart is zero. Since cart is placed in the equilibrium position. The kinetic energy of the cart is zero. Therefore the expression for the total energy is,

$E = (PE)_g+(PE)_{spring}+KE$