Answer:
<em>The primary coil has 13,400 turns</em>
Explanation:
<u>Voltage Transformers</u>
A transformer is an electrical apparatus that converts an alternating electrical voltage to another. Step-down transformers lower the voltage from higher levels (kilovolts) to consumer levels (120/240 Volts).
The ratio between both voltages can be computed as
Where V1 is the primary voltage and V2 is the secondary voltage. This ratio depends on the turns ratio of the coils wounded in a common magnetic core.
Being N1 the number of turns of the coils of the primary side and N2 the number of turns in the secondary coil. Both relations give us
Solving for N1
We have:
Calculate N1
The primary coil has 13,400 turns
V1T1=V2T2. vi = 25L T1=273+20 V2=273+35
Answer:
The angular acceleration is
Explanation:
From the question we are told that
The angular speed is
The angular displacement is
From the first equation of motion we can define the movement of the record as
Given that the record started from rest
So
Unbalanced forces
When the forces acting on an object do not balance, the resultant force will cause the object to accelerate in the direction of the resultant force.
In other words, a resultant force on a body will cause it to change its velocity. This simply means that unbalanced forces will cause:
acceleration
deceleration
change in direction. The relationship between the resultant force, the mass of the object and the object’s acceleration is:
resultant force (N)
=
mass (kg)
×
acceleration (m/s
2
)
F
=
m
×
a
You will have to be able to state this equation in the examination.
Question
A car weighs 1,000 kg. The resultant force is 5,000 N. Use the Fma triangle to find the acceleration of the car.
Answer:
a) E = V/L x^
b) R = ρL/A = ρL/π(d/2)^2 = 4ρL/πd^2
c) I = V/R x^ = V/(4ρL/πd^2) x^ = πd^2*V/4ρL x^
d) J = I/A = [πd^2*V/4ρL x^]/π(d/2)^2 = V/ρL x^
e) ρJ = ρ(V/ρL x^) = V/L x^ = E