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What is the formula for determining electrical power?
Electrical power (P) can be calculated using the formula P = V x I, where V is the voltage in volts and I is the current in amperes. Alternatively, power can also be calculated as P = I^2 x R, where R is the resistance in ohms.
What is the formula for circular motion?
The formula for circular motion is: F = mv^2 / r, where F is the centripetal force, m is the mass of the object, v is the velocity, and r is the radius of the circular path. Another key formula is a = v^2 / r, where a is the centripetal acceleration.
A solid copper sphere of radius 3cm is melted and electric wire of diameter 0.4cm is made out of the copper obtained find the length of wire?
To find the length of the wire, we need to calculate the volume of the copper sphere first. The volume of a sphere is given by the formula V = (4/3)πr³, where r is the radius of the sphere. Substituting r = 3 cm, we find the volume of the sphere to be approximately 113.1 cm³. Next, we need to find the volume of the wire. Since the wire is cylindrical, its volume can be calculated using the formula V = πr²h, where r is the radius and h is the height (length) of the wire. Given the diameter of the wire is 0.4 cm, the radius is 0.2 cm. Assuming the wire is very long compared to its diameter, we can approximate the wire as a cylinder and find its length by dividing the volume of the sphere by the volume of the wire. This gives us the length of the wire as approximately 565.5 cm.
In a series RL circuit Et equals 120 volts R equals 30 ohms and XL equals 40 ohms what is the apparent power?
The apparent power (VA) is a quantity which applies to alternating current with a reactive component. It does not apply to DC and, with AC, the apparent power and real power are the same if there is only resistance present. With AC, other than just resistance there can be capacitors or inductors (coils) present. Perfect examples of these types of components do not dissipate power but do conduct current if AC voltage is applied. In your example, the resistive component is 30 ohms while the reactive impedance is 40 ohms meaning the total impedance is 50 ohms (Pythagoras). You can't just add reactance and impedance. The current through the circuit will therefore be 2.4 amps (I=V/R OR 120/50). The real or true power will be 172.8 watts ( I2 x R OR 2.42 x 30) while the apparent power will be 288 VA (2.42 x 50).
If the tungsten filament of a lamp has a cross-sectional are of 5x10-9 m2 how long must it be have a resistance of 120 ohms at 20 degrees Celsius?
To find the length of the tungsten filament, you can use the formula: R = ρ * (L/A) Where R is the resistance (120 ohms), ρ is the resistivity of tungsten, A is the cross-sectional area (5x10^-9 m^2), and L is the length of the filament. Rearranging the formula to solve for L gives: L = R * A / ρ Given the resistivity of tungsten at 20 degrees Celsius, you can calculate the length of the filament.
What is represented by the E I and R in the formula E IR?
In the formula E=IR, E represents voltage (in volts), I represents current (in amperes), and R represents resistance (in ohms). This formula is known as Ohm's Law in electrical engineering.
How do you calculate internal resistance?
You need to use the formula E = IR + Ir where: E is the e.m.f. of the power supply (the theoretical maximum voltage across the terminals when no current is flowing) I is current R is resistance of the circuit (load resistance) and r is the internal resistance of the power supply. Therefore, you can rearrange this formula to give r: E = IR + Ir (Subtract IR) E-IR=Ir (divide by I) (E-IR)/I=r or r=(E-IR)/I
How do you calculate resistance?
You need to use the formula E = IR + Ir where: E is the e.m.f. of the power supply (the theoretical maximum voltage across the terminals when no current is flowing) I is current R is resistance of the circuit (load resistance) and r is the internal resistance of the power supply. Therefore, you can rearrange this formula to give r: E = IR + Ir (Subtract IR) E-IR=Ir (divide by I) (E-IR)/I=r or r=(E-IR)/I
State ohms law and give the formula?
The Ohm's law is defined as voltage propositional to current. The equation given by V=IR R IS THE PROPOSITIONAL CONSTANT
Why Does resistance cause voltage drop?
According to Ohm's law i.e. E=IR. When we increase resistance, keeping current constant, voltage will increase as in the above formula since E and R are directly proportional.
What is the formula of calculating effective current if resistor and voltage is given?
I = E/R or Current = Voltage/Resistance (Ohm's Law)
What is the formula I equals E over R for E?
I=E/R You need to multiply both sides by R to get the R to reduce out of the right side. I*R=E
What is a sample voltage problem and formula?
The formula for voltage is: E = I x R (E is voltage measured in volts, I is current measured in amperes or amps, R is resistance measured in ohms). Sample problem: An Mp3 player has 40 ohms of resistance and 0.1 amps of current flowing through it. What is the voltage that supplies the Mp3 player? Start with the formula, E = I x R. Put the values given into the formula: E = 0.1 x 40 Now, do the math: E = 4 volts
What is the formula for the statement of Ohm's Law?
v=iR (v=potential difference two pts, R=resistance)
What is the formula for figuring curvature of the earth in any given direction?
The curvature of the Earth in any direction can be calculated using the formula for the Earth's radius of curvature (R), which is given by R = a / √(1 - e^2sin²φ) where a is the equatorial radius of the Earth and e is the eccentricity of the Earth. By determining the radius of curvature at a specific latitude (φ), you can find the curvature in that direction.
How much amount of heat will be produced when one amphere current flows through a conductor?
you need more information my way. you use 2 formula v=ir and p=i*i*r. i=current r=resistance v=voltage and p=power (heat given out)
What is the formula for calculating the electric field intensity at a distance r from a point charge q, given by E kq/r2, where k is the Coulomb's constant and r is the distance from the point charge?
The formula for calculating the electric field intensity at a distance r from a point charge q is E kq/r2, where k is Coulomb's constant and r is the distance from the point charge.
