Engineering Sciences
"Future REE! Dito ang foundation ng electrical engineering - Physics, Chemistry, and Engineering Mechanics. These sciences explain WHY electricity behaves the way it does!"
REE Challenge
Engineering Sciences - The physics behind electrical systems!
1. Physics Fundamentals
Mechanics
- F = ma (Newton's 2nd Law)
- W = Fd (Work)
- P = W/t = Fv (Power)
- KE = (1/2)mv2
- PE = mgh
Rotational Motion
- T = I x alpha (Torque)
- w = 2 x pi x f (Angular velocity)
- P = T x w (Rotational power)
- KE_rot = (1/2)I x w2
2. Electromagnetism
Coulomb's Law
F = k x q1 x q2 / r2
k = 9 x 10^9 N-m2/C2
Magnetic Field
- B = mu x H (Flux density)
- phi = B x A (Magnetic flux)
- F = BIL (Force on conductor)
Faraday's Law
EMF = -N x d(phi)/dt
Induced voltage due to changing flux
3. Thermodynamics
Heat Transfer
- Q = mc x delta T (Sensible heat)
- Q = mL (Latent heat)
- Conduction: Q = kA x delta T / L
Efficiency
eta = Output / Input x 100%
Power loss = I2R (Joule heating)
4. Electrical Material Properties
Conductors
- Copper: rho = 1.72 x 10^-8 ohm-m
- Aluminum: rho = 2.82 x 10^-8 ohm-m
- R = rho x L / A
Temperature Effect
R2 = R1[1 + alpha(T2 - T1)]
alpha_Cu = 0.00393/degC
REE Pro Tips - Engineering Sciences
- - Faraday's Law is the basis of transformers and generators
- - Remember: Power = I2R = V2/R = VI
- - Magnetic circuits are analogous to electric circuits
- - Copper has better conductivity than aluminum
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